Yes, possibly…
I did read in an article that as of Jan 2021 there are about 21 Bil. fiat/paper dollars collected in exchange for USDT.
This amount can cover only a small fraction of the current valuation of all of the crypto-coins.
If we assume for a moment that all other crypto coins disappear, and there are 21 mil. bitcoiins, then the highest possible price of BTC seems to be no more than $1000 …
The whole crypto market looks a way overvalued.