If people want them or need them sure
I personally have no interest of holding any or even trading dollar pairs, rarely do i ever trade unless i cant get the coin without trading it for USDT
USDT is used as a safe zone, and may rarely be less good when used for trading. stablecoins are usually used as the final destination of the exchange if they intend to do WD with their local currency, because stablecoins have an immutable value. besides that stablecoins are also usually used for savings