I agree OFC. I think all cruise ships should have one adult pool. One of my biggest disappointments with the new Carnival Magic is that it does NOT have one. As I like to point out, "the Disney Magic has more Adult pools than the Carnival Magic".
Yes I am on a campaign to get Carnival to make the aft pool an adult pool on the Magic, but alas it looks like it may be going the other way. Looks like they will be opening all the adult pools in the fleet to kids. Bad move IMHO.