No. Stablecoins only exist because fiat <-> crypto trading is a massive pain. Nobody wants to own stablecoins, they want easier transactions. And if the USD becomes less popular, people will switch to, for example, EUR stablecoins - there's nothing special about the dollar here.
On top of that, transaction volume is meaningless. Those $27.6T could be $27.6T held in escrow being traded once, or $1 held in escrow being traded 26.6 trillion times. You can't derive USD demand from transaction volume.