Feels fairly alive to me, but our server had layering removed two weeks ago so that's likely the largest culprit.
What they reported, at least how it reads to me, is that it was incredibly popular during that quarterly release and that there is an active community still playing it. This isn't me being a doomsayer, but a lot of you clearly read the words of the released statement with 100% conviction that it fits your narrative completely. Without actual hard numbers you would be borderline retarded to assume anything regarding the health of classic.
What we do know is that it had a lot of hype and a lot of people subscribed for that quarter. What we don't know is how many people were subscribed prior to classic releasing, and what the numbers look like now. If live had say 3 million people playing it a month before classic, and 2.5 million people subscribed before that quarterly report, this still says nothing concrete about the two months after classic released. What we can assume is that retail subscription numbers are probably pretty static at this point (prior to classic, it was like 2 1/2 months into it's patch cycle, which is about a few weeks past the point that people taper off) and that any notable subscription loss at this point would be a result of people losing interest in classic (people certainly weren't subscribing in mass in middle to late August because of 8.2). All we know is that they stated it's well above pre-classic subscription numbers, and that's all we're ever going to know because they don't release exact numbers.
My numbers above are entirely made up, but assume that the 2.5 million I cited was true. From that you would have to guess what "well above" would mean using said number.
I like classic a lot, I really do, but the fanaticism from select individuals here and in-game is pretty retarded. It feels like some people aren't bound in reality, and you're easily the worst part of the community (again, whether it's here or in-game). You see what you want to see though.