From a strategic point of view, neglecting farming is folly. The shadow cast by solar panels is greater than wind turbines, and with the added disadvantage that crops can't be grown on the land on which they stand. Which leads me to believe there should be some form of restriction on good arable land being used for this purpose.
There is a rather crazed logic that farming is now uneconomic, because produce can be imported more cheaply than we can grow it Because of this "carpet baggers" sense an opportunity, which is giving rise to tree growing, schemes and solar farms. These all have the feel of the market making a quick killing that will disadvantage our food security. Even though it will make some investors very happy.
It is short sighted to believe that we no longer need to grow our own food, simply because imports will provide all we need. It is a bit like selling a kidney to make a "quick buck" in the belief that dialysis will cover any short-fall. I mean ... what could possibly go wrong?
Farming will continue to undergo further fundamental shifts in technology and practice.
The days when farming was undertaken by horny handed sons of the soil toiling in a rural idyll are long gone, currently replaced by machinery and extensive use of pesticides and chemicals.
Industrial and vertical farms may become increasingly the norm. Crops grown under artificial light and heat, using optimal amounts of water and fertiliser, bred for for rapid growth, harvest automated. Invulnerable to weather or disease. Yields will be many times higher than traditional.
This already happens in some parts of the world - much salad stuff coming from Spain is grown under cover minimising disease and water consumption with crops harvested up to 5 times pa. A large acreage devoted to fruit and vegetables may be history.
I understand most fish is now farmed - either in the UK or overseas. There are issues related to pollution etc, but the hardy fisherman heading out to sea battling the waves to catch supper are disappearing fast. Factory farming and mega ships have/will largely replace them.
Livestock is an area where standards of welfare are more important. Chicken was an expensive luxury 80 years ago - now cheap protein - although I am personally somewhat unhappy about this.
"Digging for victory" which dominated in WW2 and the preservation of agricultural land may not be so relevant in the future. Traditional attitudes and expectations of farming will likely change.
The issue may not be insufficient farming land, but what to do with all that which is surplus to requirements and risks becoming and overgrown wasteland - plant more trees, use for leisure pursuits, build bigger houses, etc etc.