The difference is that they can never stop you custodying the bitcoin yourself.
Bitcoin won't become "quaint" - it will always sit there as the hardest money mankind has ever seen (and likely ever will). If they try and create tokens that don't represent bitcoin i.e. creating them out of thin air, then they will go down in value relative to bitcoin, just as we are seeing with fiat currencies and people will move their wealth back into bitcoin.
Decentralised exchanges like Bisq mean that people will always be able to get their hands on the real thing.
Bitcoin won't become "quaint" - it will always sit there as the hardest money mankind has ever seen (and likely ever will). If they try and create tokens that don't represent bitcoin i.e. creating them out of thin air, then they will go down in value relative to bitcoin, just as we are seeing with fiat currencies and people will move their wealth back into bitcoin.
Decentralised exchanges like Bisq mean that people will always be able to get their hands on the real thing.