As an Icecrown pvp-focused player (Mootykins) (I literally live in a 2D dimension where swords carry more weight than the actual law of the land), this is a change that I thoroughly disagree with. The argument that only "real PvPers" want this change diminishes everyone who is not playing 15 man premades with a specific guild and a specific group of people who absolutely want this change to happen because then they actually get pops.
*Premades are finally alive again, instead of not facing a premade who worked hard for their gear under the same circumstances as you yourself did you will be facing 3 times bigger guilds who have all had an easier time generally speaking to get better gear than all of you. Also, this change doesn't just affect a few specific people who play alot of premades, if changes things for everyone. The small 3 man group running BG's trying to be competitive from Lordaeron will get absolutely annihilated, not to mention the Icecrown players who DON'T want to play versus people with relatively low gearscore. If I could pick between playing against a Lordaeron premade with a 700 gs lower average and a fullbis premade from Icecrown, I would pick the Icecrown team 10/10 times.
*Que times are now significantly lower, as such, it may be a good idea to make dungeons and BG's cross faction. This will decrease the que times by quite a bit, especially if you enjoy solo queing.
*Only aspect currently not enjoyable, is the hate between Lord and ICC horde, who would have guessed that people who spent three times the ammount of time leveling up and even more getting worse gear than their Icecrown counterparts would be upset. And who would have guessed the Icecrown players would not want to play with or against players who they don't know, are never going to interact with in a guild basis and who are worse geared than them on average every single BG? This is something that I can live with and I knew was going to happen.
So next time before starting to flame about how bad this change is for pvpers, ask a real pvper first. If you really claim you are a pvp player and you still don't want to or enjoy playing in big scale premades versus people who you will either demolish or get absolutely annihilated by then you're a decent human being and I love you, bless up play the game whichever way you want to play it my guy, don't let anyone tell you that you're not a "real pvper".
Finally, I want to say that I played on Lordaeron and then I realized that the only fun to be had on that server was streamsniping levlers in Hellfire until they quit playing the game because of sheer frustration and anger combined. Stay woke.