The situation is apples and oranges.

Dumping Flash and Java took years, and was driven by rapid adoption of mobile devices that either didn't support them at all (Apple) or very well (everyone else). There was an already deployed alternative (Javascript).

Javascript is buried much deeper in modern websites and would be much more difficult to replace than either Flash or Java Applets were for most sites. For most sites Flash was just to play videos or display ads. Many sites only had to replace an object tag with a video tag. Java Applets were fairly niche in the first place, so aren't really comparable.

In addition there isn't currently a viable alternative for Javascript. Maybe WebAssembly someday, but currently it's designed to supplement Javascript not replace it.

Big changes do happen and look small only in retrospect.

But they don't happen overnight. I didn't say change wouldn't happen, I said it wasn't likely to happen anytime soon.

Let the record note my gripe was only with the genie/bottle wording, which indicates an irreversible change :)