And they will stop people from making bitcoin transactions how, exactly?
It's a bit silly to come in and dismissively say "the state will regulate it anyway" when the whole point of the technology is that it technologically prevents central actors (like a state) from interfering.
It's a bit like saying "nah, the MPAA and RIAA will shut down filesharing." Nope. They shut down Napster (which was centralized), but BitTorrent works just fine thank you very much and the media industry has fundamentally changed as a result.