Humm, I am honestly not too sure what you're trying to say here.
We do want competition and innovation so forcing a super-costly banking license on start-ups is a bad idea imo,
Stablecoins have a massive use case though, just look at the growth:
https://stablecoinindex.com/marketcap
It's not an enigma whether they'll be regulated or not, they ARE being regulated right now, see MICA in Europe or STABLE act in the US, and that's just the start...
I already know about MICA but I'll check STABLE, as well. What I highlighted was also about the stablecoins backed by digital assets not just the US dollar. Additionally I question whether they will be acknowledged as stablecoin or digital asset when the existing fiat currencies are digitalized. Thanks for nice inquiry 😌
Afaik crypto-backed stablecoins are regulated under MICA, and would be under STABLE because the law has enormous scope.
Still unsure of what you mean by "when the existing fiat currencies are digitized". Fiat has been digitized for decades now: the number on your bank account do not represent actual paper reserves, you also have service like PayPal and CashApp that transfer digital fiat all day.