Downplaying compared to what? This kind of adoption is certainly something Haskell never gained. But all those companies (or analogous ones) adopted C++ much faster. In fact, they've adopted faster virtually every language they're using seriously. So it's a great achievement compared to every language they've never adopted at all, but not such a great achievement compared to every other language they have adopted.

> that when the time gets to be rewritten it won't surely be C++.

It looks like it won't be Rust, either. I mean, some may be written in Rust, but not the majority. My point is just that as much as some erstwhile Haskell fans have taken to Rust, comparing Rust's adoption to Haskell's - a language whose joke motto was "avoid success at all costs" - is not the right metric. Given that Rust's goal was to replace C++, its success should be compared to C++ and other languages that ended up achieving similar success. I'm saying that compared to them Rust's success has been mediocre, if that, and it's not a young language anymore by any stretch of the imagination.