Long-term Google trends graphs are kind of useless because they're a percentage of queries over a period of time when the demographics of the user base was changing as millions of new people got on the internet.

Here's the one for javascript:

https://trends.google.com/trends/explore?date=all&q=javascri...

Clearly javascript has been slowly dying out. But wait, that can't be right.

They're also a poor proxy for usage because the existing user base with feeds already set up doesn't have to do a search query to continue using it, so if a large number of them lose access at once, it's barely a blip because they wouldn't be doing searches for it either way.