No, not really. Mixers are in a grey area that is likely to get darker and darker. If the US government decides to ban mixers, the debate will be very short and you will have to learn how to post in the Gambling section
This is just a protective measure for Theymos, for Bitcointalk and (by consequence) for the Staff. For regular users there is (so far) very little risk, but if you have any doubt, go see a lawyer.
Don't overthink my words, I don't see the future, I don't have any secret information and I don't know anything about laws.