I think in an hyperbitcoinized world there would be *zero* need for it. The only use it has right now is to leverage long a Bitcoin trade. This is why people want this financial tool. It's to spend without feeling like they are missing out on NGU.
I disagree with the last part.

This isn't what credit "should" have been. What credit should have been is not something that is bound to disappear.
Maybe I'm missing something, but i don't see why someone, in an hyperbitcoinized world, would put 1 Bitcoin as collateral to receive 0.5 Bitcoin.