1. The newbies should be restricted to posting only in Beginners and Help Board.
You do realize this would mean 75% of the topics you've created wouldn't be possible if you had your way, right? Including the one I'm reading now.
Cons:
1. It will limit the chances of a user in a campaign to complete his/her weekly task. However, I don't know if newbies involves in campaigns or not.
You forget the real Bitcoin users who run into a real problem, and post on Bitcointalk for a solution. They won't find that solution on the "Beginners" board, they find it on the tech boards. Those real users shouldn't be restricted in any way, as they're
the future of Bitcointalk.
The users who join for "campaigns" will keep doing so, with as many accounts as they can. The real user won't wait for 90 days before he can ask a question.