My dad suggests an alternate proposal to make a stablecoin; rotating between a group of trusted sources/sinks of tokens, (he's an economist who was on the original cypherpunks list) https://daviddfriedman.blogspot.com/2017/12/stable-cryptocurrencies.html …
It's a well-informed design, so "plausible", but I read it pretty quickly and I'd have to think deeply about possible attacks / failure modes before I upgraded it to "promising". That's my fault, not theirs, though.