You don't agree with the notion that many tech products like web languages (or browsers, operating systems / mobile platforms, or whatever) tend to trend heavily toward a single dominant product (either due to one simply being better, and or a benefit derived from scale of use such as plugins or knowledge availability etc etc)?

Sure, they tend to, but in principle they don't have to. I would want to assume that the GP assumes that one language runs over half the web.

Of course, once actual evidence is involved, this is just an adventure in nitpicking.