My guess is, a few hundred users are enough to identify and correct most of what's missing in the language. Going from there to a million users is unlikely to make a big difference. Especially if the language's features are orthogonal (apparently they are), and the scope of the language is clear (the intended use case at least seems to be).

We'll see how it goes. I won't bet my hat on it, but Zig does seem to be on a good path to stay simple even as it matures.