TL;DR?

That looks like a very long essay / dissertation just to say 'I love rust'.

It is. It's not going to replace Python, and if maintenance is the metric, then "rewrite it in rust" is not the right move. But I do think Rust will gain traction, be a round a long time, and slowly become a complement to existing C/C++ ecosystems through wrapping and binding.

I'm just not sure the other way will materialize. Until Rust can be used to feed back into C/C++ ecosystems and long-standing projects (like the linux kernel), it'll struggle to be the primary ecosystem / language for non-new (e.g., non-trivial) projects.

At this point Rust is not the prmary ecosystem for anything.

The important and exciting new things are written in C++, not Rust. Rust has no advantages over C++ once you know C++.