Well I 100% agree that we need a Ranked Bracket. The ranked bracket would give Serious 50 PvPers something to brag about and an actual challenge rather than just steam rolling undergeared PUG groups. It would def reduce the amount of pre-mades in the groups with fresh 50s, However I don't see this being a problem. As many have said before me , this is an MMO. Make some friends , learn from them or teach them, and que warzones together. There is a very large Republic guild on my server that runs premades all day every day. I find that If I get one or two decent players in the que with me , by luck or by pre grouping, We win at least half the matches.
As for you insisting people must be using voice chat to target you , that is wrong , I consistently tell the PUG groups I'm in to zerg down the healers and to mark them when you find one. This mark stays on you the whole match and does not need to be reapplied when you die. It is actually very easy to do all this via ops chat and no voice.
If you don't want a gear handicap go play an FPS or something. Granted not all but definitely most MMO's work through progressing your character though gear levels to become stronger. If people didn't have access to better gear or a way of improving their toons power, many wouldn't play at all , and probably no one after they maxed out their characters potential.
Conclusion: Yes add a ranked 50s bracket , otherwise top end PvP'ers will have no reason to continue Subbing every month. But , DO NOT do it for the reasons sited in this post.