Mate, one part of me hopes that the whole TV thing falls in a heap and we go back to where we were a few decades ago, but it's unlikely to happen any time soon, and the elite are unlikely to break away on their own any time soon either.
Unless that happens fairly early on in the new stadium's lifetime, it's unlikely to be as catastrophic as you're predicting, inflation, even at the current low rates, will make any debt appear smaller ( in real terms ), then it is when it starts off at. If the bubble doesn't burst within ten years of us moving in, I really can't see it being a problem. If said bubble doesn't burst for fifteen years, then we should be quids in.
Admittedly these figues are based on scribblings on the back of a f@g packet, but I'm happy for you to vault me if I'm wrong.