the end-game is to get dollar-denominated stablecoins on lightning.

I can list some good things about that. I can list some bad things about that.

It's being built in a permissionless way, meaning that there's not a consensus change needed or a need for anyone who isn't using the system to do anything. So, if there are enough people who want to use Taproot assets, then it'll be used. if nobody actually wants them, then it won't be used.