I was comparing Rust to the popularity of other languages at the same age. Its adoption rate is not fine for a language that old if it aims to one day be as popular as C++ is today (or even as popular as Go is today).
The only modern language you listed is Go, which had Google backing it and is a simpler language overall. The rest achieved their popularity when the industry was smaller and there wasn't as much competition.
Those of us who were programming in the nineties and before remember there was a lot of competition [1]; not less than today. It's just that not much of it survived to this day in any popular form. Also, C++ didn't have any stronger backer than Rust, at least not at first. (BTW, Go's introduction was closer in time to Python's or Java's than it is to today; both Go and Rust are already fairly old languages)
[1]: In the application space, there were VB, Delphi, Smalltalk, and a host of other so-called "RAD languages". In the scripting space, Perl was dominant. In the low-level space, we had the entire Pascal family, with Ada and, to a lesser extent, Oberon.
