If someone came along with a sack of cash and the intention, they could buy the CG and build a new ground easily enough. Similarly if someone wanted to build a new facility elsewhere, had the cash, it could be done.
Wherever we bought land the council would hav to approve whatever we had planned and I'd imagine they would flatly refuse. Why grant planning permission for something that is going to result in a loss of income for the tax payer. That's why so many clubs that hav done this have moved outside the council boundaries. Our best chance is to work with the council , they would be open to anything that made the club more sustainable and increase revenues both for the club and the council. What is needed is a long term lease.