Sure, but users don't have to pick. They could choose to recognize their eth on one chain and USDC on the other, just long enough to cash out their USDC for rea

Sure, but users don't have to pick. They could choose to recognize their eth on one chain and USDC on the other, just long enough to cash out their USDC for real USD from the forked chain (as long as Circle/Coinbase has liquidity to do so). At that point the user would be free to use a different stable coin if they chose.