Even Visa and Mastercard payments are doing fine than stablecoins, the majority of people are used to real-world payment solutions, not stable coins, This is why I believe that CBDC will do very well in the real world, people care less what the government plan might be introducing CBDC, they are going to use it, only Bitcoin maxis won't.
The future of stablecoins will be shaken if the government rolls out CBDC and forces people to use it so they can easily control us. One more thing, if cryptocurrencies are widely recognized and the government requires exchanges to cooperate with local banks to create a gateway for direct trading in local currency, then the stable future of money cents would also be a question.
To answer what the OP is referring to, I don't think increased adoption of stablecoins will be the key to crypto dominance. In my opinion, bitcoin represents cryptocurrency and only when bitcoin is widely accepted and used can it be said that cryptocurrency will dominate.