The only thing I don't like about this is it seems World of Warcraft Gold

The only thing I don't like about this is it seems like you guys are designing LFR to be easier than heroic 5 mans. I mean, if you don't have to prove you can do the job to do LFR but you do have to to do heroic 5 mans, what does that say about the LFRs? I understand that initially, getting into an LFR will require heroic 5 man ilvl gear and thus require you to have done the proving grounds for your chosen role, but later on, World of Warcraft Gold once better crafted gear and presumably valor vendor gear is available, people may be able to get the ilvl they need to do entry lvl LFRs without actually doing heroics, thus they wouldn't actually have to do the proving grounds to prove they aren't artards. Have you planned accordingly for this eventuality?

I also want to say that while I love this idea, I have my doubts about how effective it will actually be. I expect it will have a measure of positive impact, but I think that's going to be limited to the terribad players who actually are willing to put in effort. It'll force them to learn to play better but I also think it'll do nothing for your average AFKer who will do the proving grounds to unlock heroics and subsequently LFR, then they'll just AFK their way to gear in LFR.