I think the failure of UST has been seen from the De-pegging they made, I completely like Terra's idea with the algorithm they made, but the team still didn't make changes to the algorithm and let UST continue to be printed without Fiat guarantees.
In the future I would like to see stable Coins that are better than UST, without Fiat guarantees, but using Gold guarantees and developers need to do some calculations in order to make the coins really stable.