Well, this may happen, not because the banksters are able to outlaw the stable coins, but because of LARGE inflation or hyperinflation.

If a loaf of bread costs
2020 - $1.00 - 12,500 satoshis
2021 - $10.00 - 1,200 satoshis

What's the use of stable coins?
Stable coins are only a transition mechanism.
Because we can't easily move from dollars to bitcoins.
So dollars to USDT - USDT to bitcoin is process.
Is the game traders play.

But, hyperinflation is coming
especially in commodities that keep you alive.

You know ButtCoin was a joke, but if someone made a token that was worth one roll of toilet paper, and you could exchange tokens stored for a real roll of TP, this may be the best stable coin.