Is there a way to fix no one being able to short these things? The counter party risk and irrational exuberance outlasting ones solvency should be solvable somehow?
Letting pessimists enter the market rationalizes things that much faster. For something like BTC, the market is actively pressured to stay irrational because any non-holder who expects prices to drop can't enter - you only play if you're bullish.
the other option is a betting platform where people just take side bets, but counter party risk is substantial and your short is limited by the trade collateral and vice versa for your counterparty taking the opposite bet.