> The Bank of England couldn't keep their peg, so what's the gold standard for a dependable cross-asset peg then?

I'm not a crypto expert, but naively I would at a minimum expect uncorrelated collateral to be part of the picture. DAI runs on ETH, so collateralizing via an ETH mechanism seems like possibly not the best choice.

I would expect that the peg would depend on something that exhibits a low correlation with crypto asset prices and a very high and dependable correlation with USD, like money market funds or Treasuries.