I dont see the issue - I dont care if someone fills every slot on their account with 90s. It doesn't affect my enjoyment in ANY way whatsoever. The level grind is NOT a right of passage, nor does it teach you how to play at end game. I stopped playing at the beginning of Wrath, and came back a few months ago. Guess what? I had NO idea how to play any of my classes once I reached 90. The changes were vast for my classes but I learned. It comes down to old school elitism.
So what? I boost to 90, I still have to gear up. I still have to grind honor/justice/valor. I still have to level profs, I still have to learn the fights and soon, I STILL have to grind out another 10 levels. I'm not sure why anyone would be concerned with how other people play the game or spend their money. So you wipe in LFR, life actually continues if you leave the instance with no loot/valor.
I'm not a fan of judging people but if you think blizzard needs to get rid of the 90 boost, you are a selfish, simple person that is more concerned with what other people are doing and blaming "bads" because you cant find a guild that works for you and the way you want to progress.