BECAUSE THEY WON'T BE
Do people get good loans borrowing against stocks. The answer is yes especially with low loan to value ratios. BTC is about to be "normalized". It is pristine collateral. Smart contracts will allow BTC to sit in collateral until the loan is repaid and any default instantly covered.
The fiat industry will understand the guaranteed ROI of this and make products for it, BECAUSE THEY ALWAYS DO.
The lowest interest loans (other than potentially government subsidized home loans) that exist will in the future be collateralized by BTC. Why would they not be?
Stop thinking like a bitcoiner for a few moments and think like a banker.
I can loan this guy money as say 5%, he will collateralize the full value of the loan for the entire duration of the loan, if he defaults I instantly get paid by a "robot".
You may have to lock up 6% of your holdings to borrow 3% but who give a fuck when my goal is to NEVER SPEND IT. Every asset class that has ever emerged and normalized has done this in time. Never has one been so perfectly suited to it.
I do think one day we will "spend bitcoin" the way many fantasize about. I think I will die before it happens. It requires not just the death of fiat money, but the fiat world and that will take time. If we are on a star ship we are on a generational ship, we are generation zero. We will have a lot of fun, build our lives, raise our kids and grand kids but we will DIE IN SPACE. We got on the ship for decedents we will never know. But they will know of us.
In the interim we will build the infrastructure for them to use when they step onto a "new planet".
Honestly as early as this is, we should call ourselves, "Generation Zero". It is the mission you signed up for, whether you knew it or not.