Personally, I'm hoping that once DT fills up, the older more knowledgeable members of the forum will be given precedence in the system by their userID
If the list gets too big and the limitation is automatic then it would make much more sense to increase the minimum required amount of total inclusions a member must have: +2 or +3 instead of the current zero for example.
Or it could be manual with explicit white- and blacklists.