It’s definitely ideal to have a trustless zUSD. Maybe something like Maker where the usd is over-collateralized by zec? That would be a mostly trustless model that also avoids the issue of the chain becoming ‘top heavy’, since the value of the usd on chain is always strictly less than the market cap of Zcash.
I think the ability to directly trustlessly swap between zec and zusd on-chain, without using any other chains like eth in between, is very important. If zusd is a killer app for Zcash, we don’t want it to have the platform risk of relying on another chain.
Agree it could be a very good MGRC funded project