That way all the relative newbies can post in "PPL Training" and all of the qualified guys that discuss in the in's and out's of aviation can avoid newbies ?
And what happens if a newbie asks a good question which can only be answered properly by a more experienced person?
My experience with such a split is that the newbie forum will quickly become silent while all the newbies migrate to the qualified forum, since that's the place where they can receive answers to their questions. Unless there's enough qualified people who volunteer to keep track of the newbie forum.
What does help, probably, is creating a sort of FAQ list, where the questions that pop up every few weeks, are covered in great detail. Like I did with the sticky about flight training in the US.