One advantage of stablecoins is price stability. Merchants don't have to worry about price volatility when transacting in stablecoins. In the past and present, there have been a handful of projects proposing issuing altcoins (non-stablecoins) that will lead the future of crypto payment. What's the fate of such projects, will there ever be considered viable?
It seems that you have already chosen the stable coins as your bet just because of its price stability, But don't forget stable coins are also one of the altcoins. I think stable coins and the decentralized cryptocurrencies are also suitable for payment solutions including those new projects, As long as there is an appropriate method that will solve those problems that frequently happening in most crypto payment platforms. such as slow transaction speed, high transaction fees, etc. if all those problems were solved I'm sure there will be no more problem anymore.