Haven't RTFT, no time to do more than glance through it.
I live fairly rurally and I know quite a few farmers. I know enough to understand that farming is bloody hard work, and that the farm is constantly tended for an income now, but also stewarded, for the next generation. It's hard work and it's constant: no one goes combining through the night for fun, they combine when they can. Persuading a farmer to go on holiday and leave the farm takes some doing. And as PP have said, most farming families do not have spare 10s of thousands lying around.
If you don't have family farms, the land goes to multi-nationals, who will screw everything out of it: if you think current agricultural methods are bad for wildlife, wait until the bean-counters run everything. While a farmer who cares for his land will work to get grey partridges back on his land, someone in an office selecting the cheapest contractor won't give a shit, and the contractor won't either - not his land, doesn't live on it.
And also, you sure you want multinationals to have even greater control over our food supply than they have already? You sure?
Unfortunately most politicians have almost no understanding of the countryside, and the current lot in power have just demonstrated this in spades.
It's just a fucking stupid thing to do: the potential for damage is huge, and the tax take from it will not make a significant difference to the country's finances.