You'd have to assume that no one in the crypto business has asked those questions. I'd bet that there are regular meetings to discuss exactly those questions.
The actions in the market strongly suggest that the concerns that you've raised are baseless or at least overblown.
Which begs the question. If say, the US gov invents their own netcoin/cryptocoin, backs it in some strange fica way as an alternate type of credit or currency, wouldn't bitcoin, and by extension all the cryptocoin exchanges pretty much loose most if not all their value? Wouldn't all bitcoin/non government crypto become illegal, like we can't print our own dollars?
Fed Chair Jerome Powell told lawmakers this summer that “one of the strongest arguments” in favor of a central bank digital currency is the notion that “you wouldn’t need stablecoins.”
Some issuers like Circle and Paxos are contemplating that future as well, believing that the payment networks they build for their stablecoins could be used as roads that a Fed digital dollar could drive on.
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