Depends on the timeline I suppose, under a Bitcoin standard credit markets should shrink for the consumer as deflation drives down the cost of home ownership, car ownership, and those big-ticket items, a few who managed to save in Bitcoin can use their equity straight up.

If fiat is still around, then some will rather opt to borrow against bitcoin for large purchases if that's the more tax efficient way

I would imagine that the deeper we get into a Bitcoin standard the more people need to earn it versus buying it and there will be a time vs cash flow difference where people would choose to acquire things now and pay a premium and that's where I see credit working but Bitcoins annual appreciation would have to be pretty flat or you just reking yourself