TP removal would be pretty garbage
If you still want to have some freedom in your runes and build, you're now going to be forced into people who can either split fucking awesomely (Yi, Trynd, Fiora), or who can more effectively roam without sacrificing anything for it (Shen, Sion, Galio). If you want to play someone who doesn't fit into those and still survive in the meta that's been established for top lane then you're going to need to try and find a way to fit Predator onto your build and that's pretty fuckin lame.
Removing TP will effectively stifle champion diversity more than anything else. Before it can ever be done, top lane needs to be fixed up.
As it is now, I can fall behind a bit but still make a good TP play to help my team and remain relevant in the game. If TP gets removed, now if I lose lane I have no chance to come back, because I keep getting this fuckin' Fiora jumping into my face more and more often (Or a Panth who can tank like two turret shots before taking ANY damage and that's lame).
I don't mind the meta atm in any way, really, and I play 3s more than 5s right now to be completely honest. But if TP is removed I think all it's going to do is hurt the game.