By making new players only allowed in the TA for their two week trial, I am thinking that they won't get that feeling of action, camaraderie, and overall bad bellybutton affect (yes I know some don't like the play style of the MA's, but really you can find all different styles of play). Without finding this out within their first two weeks, I think newer players won't be drawn to the game, and will perhaps leave.
Same with the idea of starting in early war. They probably won't like the plane choices, the few amounts of people, and the "harder" flying characteristics of the plane choices, unless they somehow become official vets after their two weeks in the TA (assuming they stay after that).
But thats just my 0.02 cents, take it as you want.
donkey:aok