I'm of two minds about the AP press pool thing. On one hand, I see the benefits of not having a rank of MSM there to be taunted, thereby removing a target. But will it? I don't think so, he'll just say the same things only instead of pointing to the full press box, he'll be pointing to an empty one and saying that the MSM is too 'cowardly' to face him and the 'truth'. It will also restrict the coverage to what that particular AP pool reporter thinks is important, rather than a range of reporters reporting a range of things based on their own journalistic experience. Plus, to his base, it will give more 'importance' to the radical right press as he'll stress that only the 'legitimate' press is 'allowed' to be there.
Keeping the MSM out en masse won't work. His base only gets their info from Fox and Breitbart anyway. The MSM not being there isn't going to change his message nor the audience it reaches.