I agree that the system in its current state promotes pub stomping with high level characters way to much. It also seems that many of the early access servers are the people that are running into guilds or groups of people at level cap wrecking everyone else in PVP.
It seems like BW did make a mistake in the way they did their early access because people that want to take their time and enjoy the wonderfully voiced story but also want to dabble in pvp from time to time throughout the experience, and they play on an early access server are having issues doing so. That sucks, it is punishing people for paying in advance and playing the game like most of the devs hoped their customers would play it.
On the other hand there isn't an easy fix, sure they could take population numbers of lvl 50 players that are pvping on a specific server during all times of the day, figure out which ones are ready for a 50 only bracket and then implement the fix.
But that seems like an in ordinate amount of work when they can just wait a couple months at the most and everything will even out, the max lvl players will be there on all the realms and then put a bracket system in place.
But this is all assuming that there will be a bracket system ever. They could technically never do a bracket and just put that work into making a rated system with rewards for 50's only that would have enough incentive to pull most of the 50s out of the current pvp system. It would ensure that the current system would never really die off since all new players would be in the same system even some new lvl 50s trying to gear up for the rated matches, and there would also be a place for the 50's to go that would be a fairer fight.
This plan may piss off some people and maybe even loose some subs but if in the end they put a good enough system in place they will get their market share and hopefully continue tweak it. I think it sucks BW made a mistake in giving early access to some servers but I don't think they are going to keep those servers ahead of all the other servers because it would create to many logistical problems. Just chill out if your on a server that is full of 50s pve, make and alt, or just deal with it and qq on the forums, but understand I'm sure BW is kicking themselves for the mistake...