No

Read what theymos talked about the reasons, not worth the time spent on it is there. To ban ads will not affect this forum traffic, but if signature is banned, there would be less traffic. Many people that supposed to be exposed to what bitcoin is properly will be unable to.

Signature campaign makes this forum to be lively too. Banning signature campaign is not possible because theymos will also consider others that are using it as an incentive.