You missed the most obvious which is also the most likely.
They will start to tax transactions. Corrupt the system by skimming a bit off the top.
Almost certain to happen. And a sign that cryptos will have a long life once governments start realizing the benefits of skimming
STEEM On !!
Dave
tax transactions?ouch
With the budget deficit in US, I predict that this is inevitable.
Government won't be able to keep their grubby hands out of the money flow