Med'an, thanks for faithfully overlooking my short, yet precise post. Maybe I need to elaborate and make the post longer for you to notice it.
I've played in the 39-bracket a few months during 2009, the period just before, and in the aftermath of, the XP-lock. On top of that, another couple of months in 2008.
I'll list a few reasons as to why I, and probably a fair few others, am not rolling 39.
I'd like to place a disclaimer here, the usage of the word "we" and "us" implies my opinion and no one else's.
One: we're already at 49. We have a growing community, we get BGs, we have friends incoming, additional peripheral players that will integrate into the community. It's working, and at least I am happy with the situation as it is right now, I believe there is a fair few others agreeing on this point.
Two: Andrakla presents a perfect point, as did I in my last post, with the abilities. The bracket might be bursty, but the squishy classes are getting vital points to be able to survive, outlast, compete and deal some bad-ass damage. It's balanced, but more dependant on ultimate defense to survive and ultimate offense to kill. 39 does seem more balanced due to that the nature of the fights lies outside of the burst and more within outlasting, even as a Rogue.
Three: it means a month or so waiting for all the people that might consider changing brackets to level up. People will quit playing, people will lose touch with the existing community and hence lose a lot of the sentimentality that keep a lot of people playing. The perfect 49-twinks are now useless - countless hours of work left without any reward.
Four: a lot of us left the very same bracket that you're trying to promote in order to play in this bracket. One reason might be that the attitude within the existing core on both sides is mutual towards the bracket, we all share the common goal of creating a bracket with regular BGs. It's worked out so far, and we're still progressing.
Five: 39 Arena isn't as balanced as you might think it to be. In 2v2, there's a fair few teams competing up there with actual linear fights, and these comps will in the end have a much higher chance of winning the arenas. A few, and notice that I say a few, of these comps would be a Mage/Priest, Rogue/Priest or Warlock/Paladin in 2v2, or a Rogue/Mage/Priest-team in 3v3.
Six: I'd rather watch my own fraps-clips that has the actual feel in them, that might make me come back. Not some PvP-movie made by someone other than me.
Seven: why even bring Bladestorm as an argument? Warriors get Bloodthirst and Mortal Strike in Fury and Arms respectively, something needed to make them viable. Other than that, I have seen only a very small amount of excelling Warriors, and the one I got to play with the most, and whom I (and probably the rest of the MYL-guild) found extremely skilled, was Protection. Now, Warriors are given full utility with their key-ability, Mortal Strike.
Eight: people playing in the 49-bracket right now don't seem to be caring about the apparently evident imbalance (a few people are excluded; I guess you know who you are, no offense meant - though people can justify either cause) that much. It works.
Some of the points might be repetative, but it's only to show that this community and the bracket is growing and to attempt to change a dynamic within a system with, in my eyes, seem to be working.