I'm convinced that this trend of seperation among blms will continue to show. The "HOLY SHIT WE NEED YOUR BLM even though I dont have it leveled, therefore I have no way of knowing that you're a shitty blm" way of thinking that you hear LS leaders/officers using will continue to be there. People will continue to need blms, but eventually, as we approach 99, and the way MAB bonuses with regards to the damage forumula works, this seperation will be so obvious that it will appear that Good blms are getting better, and shitty blms are getting worse.
This 300dmg avg difference that we see now may eventually hit 500+ or even 600+. As the damage difference becomes more and more apparent, less people will want to play blm, because no one wants to be continuously reminded that they suck. It's much easier to find the damage in the chatlog and do a direct comparison, than to have to use a parser to compare melee dmg. Yeah, things are situational, but with the way mab works, I cant see it working any other way.