With BTC deferral the team could actually go under if they can't raise the BTC to meet their obligations, and BTC wouldn't be so easy to borrow as fiat whose supply is constantly expanding.

I guess current owners could indeed dump that on future owners, but under a BTC standard, that level of future obligation will significantly depreciate the value of the team. The current owner won't be able to sell the team to a future owner, or would have to sell it at a steep discount.

Maybe they don't care and just want to win a championship now. Then, that's the owners prerogative I suppose.