Questions on StackOverflow might occur in bursts, after a release or a major project goes public. So statistics on the number of questions doesn't quite relate to 'interest' or 'industry usage', but more like 'churn'?
Also SQL lost traction, but a dedicated SE took off in the meantime (<a href="https://dba.stackexchange.com" rel="nofollow">https://dba.stackexchange.com</a>).<p>Stats should be aggregated at the whole SE level not only SO.
I'd really prefer stuff like this be in more of a slideshow format so I can easily go between time points and compare without having to scrub around the video and press pause/play, memorize what i'm looking at, then scrub around for another time point, etc., but I guess a video is sexier.
My own takeaways from this:<p>1. Old techs is been replaced by the newer and finer ones<p>2. Profitability effects the tend of languages<p>3. Easy (to use) is important<p>4. One single simple idea (Nodejs for example) can change the landscape so much
Does this include questions that were quickly downvoted? You get a lot of people asking things they could have found with a search, and those get downvoted quite fast.