The velvet glove is that they will tempt greedy bitcoin users, developers, entrepreneurs, and spokespeople to acquiesce in the formation of a "safe" bitcoin, which allows them influence and control through requiring their blessing, and giving assurances that all government laws will be followed, from those relating to child porn to drug smuggling to tax evasion. The general public (sheep) will heave a big sigh of releif, and mass adoption will follow.
This will provoke a response by those bitcoiners who refuse to participate, develop their own clients, or even a forked blockchain. After some time, users of this "dark, unregulated, anonymous, and illegal" bitcoin will suddenly start having their front doors kicked in by SWAT teams, and will be charged with enabling all manner of horrific crimes.
Then the real revolution begins.
i think this is a pretty good analysis in one sense, and it may be accurate, but i think it overlooks something important. The government isnt ACTUALLY concerned about child porn or and less than you might imagine about drug smuggling and tax collecting. the real threat that bitcoin represents to them is its potential for undermining their monopoly over the issuance of currency. this is where they get the vast majority of their power. taxes are a drop in the bucket compared to the power the get from the printing press. what you have outlined above does not solve this problem, it does not allow them to reclaim their monopoly over currency issuance. What ever solution they attempt will probably have to be ultimately aimed at reclaiming their most important monopoly.