but does anybody know if any discussions took place to consider banning mixer signatures from the forum?
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.
I think there is no measure of protection for anyone, protect who and for what? as has been said, here the community performed only the task of advertising. I think it's more an ethical issue and shared by all the staff, as if to say "we don't want bitcoins deriving from illicit activities"