Blockchains that support stablecoins are already here and millions of people already use them (and soon agents will use them as well).
All for worldwide, instant and extremely low fee payments and transfers.
That's just not true, and I'm not talking about "you can pay with Bitcoin in the store" use case but the stable coin use case for settlement, which you can see Stripe expand a lot in the past years.
Step out into the wider world and that isn't remotely true.
The truth lies somewhere in the middle. But in terms of mass adoption? I wouldn't say that has happened, because there is still too much friction in terms of dealing with your own opsec, keeping your keys secure, etc. Like I don't see average Joes going into it en masse. But anyone with enough determination will use it.
I say this as someone who is personally opposed to the technology on principle, but I'm not deluded to think that nobody else is using it either. It has a market.