I'm a cycling fan and I'm not sure what to think. I do believe there is an awful lot of misinformation and rumour out there. The fact of the matter is Wiggins (and Froome) would have been subject to a huge amount of drugs testing and didn't fail. Yes, its true that Armstrong was also tested a great deal and didn't fail a test, but the regime was different then. The UCI actively went out of their way to prevent discussion about doping in the 'bad old days'. That culture just isn't there anymore.
I suspect some of the recent furore around British Cycing is typical of the British disposition: we are simply unable to accept success as being something to be proud of. We seem to want to suspect every aspect of it and discredit it. Think of how the media hounded Sven (at a time when the England football team were reasonably successful) out of his job, or how Shane Sutton has been thrown under the bus.
The reality is, nothing has been proven to demonstrate that Wiggins was doping. MPs stating they 'suspect' he was is very different to knowing. But, as seems to be the case in this day and age, the way in which such matters are reported is simply yellow journalism. It can't be right that just pointing the finger, without any evidence to back it up, is accepted as gospel.
With regards asthma in elite athletes: the reality is they are pushing their bodies to the extreme. Athletes often end up with more stress fractures than the average person, for example. So it is perhaps not surprising that riding a bicycle everyday for 100km+ up and down mountains results in a higher incidence of asthma than the average population.