One way is to keep the NT game shape always the same for everyone, it would became an arcade thing.
Other thing that's related to the NT that hurts the game is merchandising, it helps keeping local players but the logic is just sad, other things should be taken into consideration; how long the player is in the team for example. And I bet that someday a coach won't put a rival player in the NT to hurt his economy or will play an own player in the NT to get some money. ( don't know if it happens, happened, etc.)
Today if you're in Div 1 and don't have a local NT player your chances to compete are lowered, unless you daytrade, tank,plays the game since the begining or is some kind of wizard.