re: Allowing transgender people to serve in the military is inevitable

You ask how this will affect entrance; the fact of letting transgendered people serve isn't a more than a PC overview since removing DADT. Upon these individuals trying to enlist (which I doubt there will be any) will be disqualified for other reasons.

Reasons such as; phsycalogical, medical (surgeries and prescribed medications) and the other thousands of things that can disqualify any other applicant. The point is they aren't going to change requirements just to be fair to a very small select group.