I wonder if the exchanges would consider getting together to create some kind of AMM to back it, where users could stake their tokens for a small return.
Or as I have said earlier, perhaps the real usecase for BTC is to back a decentralised industry standard token.
This is not my area, so I am bit sure how it is accomplished.
It really doesn't need anything as complicated as that.
Repegging to an index is something the witnesses can accomplish very easily.
BTW, not sure, not a "bit sure" :)