the success of stablecoins not call for something like a bank or a recognized office building built to show legalization and acceptance as a means of payments for transactions and services?
Definitely will call. But, I believe we do not need any regulation/legalization for that to make it more common among all people; only awareness is enough. But, we need to remember stablecoins are not decentralized which means they may collapse at any time or government may seize.
So, holding a big money in stablecoin is highly NOT recommended. From what I read from the explanation it seems quite reasonable and very risky if there is no one to back it up and at any time it could collapse. Will it be like UST in the future? I hope not.