on balance, i think it's too late to make Bitcoin illegal or even put sharp restrictions on it here in the US.
mainly b/c it's global and their are too many large, legitimate US investors involved already. think NYSE, NASDAQ, multiple hedge funds, banks, VC funds, and numerous financial luminaries and Wall St folk. just about the entire Silicon Valley wants it as fintech has been irrationally and unfairly excluded from financial innovation forever. this is their time. Wall St has begun to sense the inevitability and are climbing aboard. there are plenty of overt data points and pending signs.
They definitely won't make it illegal, I'm sorry if that's how what i said came across
Of course you can still use bitcoin, this is the land of the free. However, to stop money laundering and save us from terrorists, drug dealers and sex traffickers everyone has to use this government issued wallet software to transfer bitcoins, which enables tracking of all whitelist coins.
Yes bitcoin will still confirm any transaction, but if you ever transfer one of your whitelist coins from coinbase or your employer to a non-whitelist coin by using your own wallet software, you go to jail. If you own a blacklist coin and try to pay any business, they flag the transfer and you go to jail. Technically bitcoin still works and is still legal, but it has been co-opted. The above scenario also isn't that hard to implement, we already have it with banks and cash.
Yesterday it was the same with gold, they didn't outlaw gold per se, instead they said you had to transfer gold to the gov who gave you an equivalent amount of dollars that were the same as gold, that they could now track within the banks.
Today it is the same with cash, they are not outlawing cash,
but any amount or transaction above a nominal amount has to be kept in electronic form in bank accounts, enabling full tracking and ownership by the government, this is today. They could easily legislate this for bitcoin.
The only thing that stops that from happening is a large enough percentage of the population saying no. It sounds that many here think there will be enough who say no, my fear is there isn't.
Also, if this is how it plays out, we'll all be rich as sin. Provided of course that we whitelist our coins and pay our due (taxes). If not, you go to jail. Given this choice I'm sure many here will choose to whitelist their coins and retire. And that is how the government continues to grow.