Yoshi's post is nice, it's great to see developer insight on the official forums after coming from games like WoW that have fired their forum CM's and only post via twitter, carefully avoiding feedback issues.

However, it doesn't address the biggest problem with BA, namely getting into it and why the portal system is necessary over a standard premade queue unlocked by finishing Hydatos. BA itself is great, a challenging 56 man instance is lots of fun, it's just getting in there to even try it that's the problem.
I can understand trying new things, the portal idea maybe sounded good on paper, but when it clearly isn't adding anything beneficial to the experience and is causing a lot of negativity, why stick to it?

I also noticed they mentioned trying new things again in 5.0. Considering a lot of content in SB is experimental, I'd recommend taking the parts that worked well and polishing them before throwing it all aside and jumping into the next experiment. Start looking at what the playerbase enjoyed and deliver that in the best form possible instead of flitting from new idea to new idea.