As ptcampbell stated, I do not believe there is any collusion. It's just natural... people will get tired of reading about the same thing and stop visiting your site. So you hype up something else and see a ton of new visitors. After a while people get tired of reading about that so you come up with something new to write about which drives more hits. Eventually a pattern becomes clear, you either need to constantly write about new things or your site will be forgotten.

The changes are not being driven by any need for a new language or framework, just the hype cycle of technology. And when your business depends on that hype cycle, it is in your best interest to keep that spinning as fast as possible. No collusion or conspiracy needed.