Stable coin got more trading volume than bitcoin means it was the preferred coin for trading not for holding then how it could be a dominant crypto in the future.?
Maybe OP were confused in some things in Trading. According to his picture, tether made it to the top but it was not even worth it for me to invest my money in, what's happening in the market now is my chance to buy more Bitcoin as an investment. Bitcoin gives me more assurance than the other coins when it comes on earning profits in the process, it is all putting your faith in a certain coin that puts you where you are now.
Stable coins where likely most popular investment option during the bear market, where bitcoin and other altcoins where super unstable, most investors that wanted to be secured started to look towards safer options like tether and other stablecoins backed by fiat currencies.
Bitcoin definitely has better the better technology behind it, but I don't think it'll be stable enough to be a good option long term. Much prefer stablecoins for day to day transactions.
I'd hedge my bets on goverments adopting their own crypto-currencies in the future and then those currencies being used as the main payment source.