What do you do about high hill land . It's not viable without sub , farmers would have to pack up and leave as the only option would be to plant it with trees
I think we have to accept that food production is not always the best use for some land - this has always been the case
If land can’t produce profitable food without subs it’s time to consider other ways to make a living from it and that’s probabaly where the public goods / natural capital comes in as the kind of land you describe is potentialy very rich in that
We don’t have some god given, publicly funded right to farm and it’s conceited to think we have