Fr those wanting to know here was Rob's explaination a few weeks back....
Valid feedback, and something we continue to debate internally. When we talk about separating the playing population by hard lines, there are always 2 main concerns that often compete directly against each other: A)Can the players inside that bracket reasonably compete against each other, and B)Are there enough players in the bracket to keep wait times reasonably small.
We have initially chosen 30 as our new break point because that is the level in which players start having complete combat rotations (often because they've gotten a really important ability from a skill tree) and our data of who actually queues into Warzones has shown that we've got a good pool on each side of that break. We continue to analyze who is playing, however, so certainly if we ever feel like a particular PvP bracket is being starved we should make changes to it. Unfortunately, that's what we believe would happen with a 50 - 54 bracket. It might be populated initially, but would quickly become empty as players hit 55 and for everyone following the initial surge of levelers there would significantly increased wait times to get into PvP.
A number of players are concerned, reasonably I think, about the power differential between a fresh level 30 player and a current 50 player in augmented EWH gear being inside the same bracket. Our new bolster system should make those players reasonably competitive statistically, both with compensation for the lower items as well as some compensation for having fewer skill points/abilities (if you are lower level). Once we get this bolster bug fixed up, everyone should be able to see the kind of stats you are getting from the bolster and should give everyone a better basis for discussion.