The trouble with all of that DW is that the words "I imagine" pop up several times and as none of us know what will happen, all we can do is speculate.
I recently read a "real driving conditions" comparison between main brands and models comparing range and as an example the three Tesla models didn't fare any better than several others being between 204 and 257 miles, the Audi, Mercedes, jaguar (all SUVs) performed equally as well and a decent range if I'm honest though clearly less in poor weather, not that we get that in the UK.
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Of course just one test so not conclusive.
"The next generation of tesla batteries are supposedly good for 1000 full charging cycles, still meeting the 90% capacity target (half million mile battery claim due to this for the pickup, and million for the trucks when they start producing them)"
Is that accurate? Even if the unrealistic range of 300 miles is used then 300 x 1000 full charges = 300,000 not half a million and as fast charging and other issues affect battery life then being sceptical I seriously doubt their claims.
I'm not sure whether comparisons can really be made between US and UK revenues e.g. UK road tax currently raises around £40 billion pa which equates to 5% of government revenue or £750 per UK adult. Added to that fuel duty is another £28 billion which splits to 58p per litre in duty plus 20% vat on the total so 62% of what we pay for every litre is tax. With the onset of BEVs that revenue is going to reduce drastically and all on top of a huge hole in finances under the banner of Covid-19 so it will have to be found somewhere and once we are mostly in electric vehicles to use your own words I imagine the cost of keeping them on the road witll rockets skywards.
re: the batteries - the million mile claim is for heavy trucks. Musk has an objective of getting a 1000 mile range so that no matter what the conditions, the average US driver (must take breaks at 10 hours) wouldn't be able to outlast their battery. You could say "what about the driver who ignores the rules?" In a fleet, this doesn't occur in the US as the freight haulers are using electronic logs and extra surveillance to avoid regulatory trouble. If a "drop" comes up short of the recipient, the national carriers will send another driver who is not on break to exchange the trailer.
At any rate, to me, that makes the batteries half a million miles in their proposed truck (500 mile range or something like that). Energy density of the batteries is the catch for large trucks - cost has declined fast, but energy density is increasing slower than cost is declining (we have strict weight limits on the roads here - trucks already do more than 90% of road damage based on weight, which is another interesting aspect of the road tax talk- similar to guilting people out of applying fert or chem to their lawns to "save bay areas". Lawns have relatively little runoff compared to naked farming fields, and farms already use 12 times more fert and chem than lawns (guilting people about "damaging roads" with cars over gas taxes on PHEVs is kind of pointless here as the cars aren't doing the damage - thus since there's more road mileage here, the weight limits and fines for exceeding them is strict. If the batteries in a truck weigh 6k pounds, that's a problem as a lot of the heavy loads are closer to the weight limit than 6k).
Anyway, yes on the other comparisons. Gas taxes here are variable, but in my state, they're about 58 cents per gallon of gas. There's a handy site in the states that details how much of the road taxes on fuel actually go to roads. Overall, 70% of road maintenance is paid for elsewhere out of other revenues, and in some states, the "road tax" doesn't go to roads at all - it's just assessed because the states can even though they don't need the dedicated revenue for roads. In others, all of it does. If EVs become a large part of road mileage, the change in revenue source will be quick as construction contracts for infrastructure are not that variable and nobody who cuts infrastructure work will get reelected. It ends up in commercials, even if the commercials can be intellectually dishonest.
I think the biggest risk in all of this as all we can do is speculate is talk about wet cell batteries being used in cars in 30 years - i doubt they will be. Actually, I doubt the majority of miles will even be ridden in cars that we own in 30 years. It'll be cheaper to have a charger fleet of cars and dial up a ride from an app. We have two cars, and I'm guessing in a two income household in the UK ,that's also common. If I could dial up a car, I'd be comfortable having only one car that we own.
As for audi, mercedes and jaguar making EVs -I see that a lot of the luxury names are headed toward EVs (tesla has really screwed up their market here as an S or X is often cheaper than a comparable fossil vehicle and the buyers of those cars don't care much about longevity or reliability. If they did, nobody would've sold a V8 BMW, mercedes or any audi here in the last 20 years). Cadillac notified that they are headed to all- EV in the future and offered to buy out dealers who don't like that (that'll be interesting - cadillac has not built a reliable car in 3 decades, so I don't know why we'd expect they could build a reliable EV unless it's just a GM platform with a different skin dropped over it, with different gauges and seat materials). I'll be surprised if any of them can build a reliable car - so far, only the model 3 is putting together reasonable data, and it didn't at first.
re: the range - if they are rated at 300 and people driving on the highway or intermittently get 200, their range anxiety will be resolved as the packs in the cars go toward double that rating. I'm sure there will still be complaints then. Tesla built the first car that was rated to go 200, which was said to be impractical. They have one now rated at 398, which probably equates to 300 actual in regular use. It'll keep going up as capacity keeps declining.