With both Flamini and Arteta in the DMF role, TV isn't going to even be able to become a regular starter in that position, heck he faces more competition as well. He just needs to be patient, we only have 2 main CB's, so the chances of eventually getting to play are quite high as it's only one player who eventually has to drop out due to injury or whatever, and eventually it's going to happen. Not just injuries, with so many games coming up to play, especially after the next international break, there is going to be some rotation so again there will be more opportunities to play.
TV's got to be sensible, at the moment the partnership of Kos-Mert is solid and doing a great job, so he can't just expect to come in and replace one of them just for the sake of it. He has to do what's best for the team.