There was a similar situation the last time the NYC AG tried to shut down Tether and withdrawals from Bitfinex were blocked (June 2019). What happened was that Tether started trading at about $0.93 and USDC/DAI started trading around $1.04, as the supply of other stablecoins wasn't quite adequate to accommodate all the people fleeing Tether. Bitcoin actually ended up being the reserve currency instead: the price of Bitcoin spiked from $5200 -> $8700 over the course of a couple weeks as Tether holders dumped it to buy Bitcoin and move it to other exchanges.

Personally I'm surprised the risk premium wasn't more, but Tether is still around today despite both Bitfinex and Binance blocking withdrawals and the NYC AG initiating fraud charges against them, so ultimately the folks who decided it was nothing were right. Then, at least.