[redsaber]

question: If RustPython did indeed reach maturity, are we going to need to choose which python interpreter to install on PC? or like on certain python version we will switch to the new interpreter?

[kzrdude]

CPython developers are still the leaders and those controlling the important Python infrastructure. You have to ask them. It's quite likely RustPython has no influence whatsoever on the question, and also quite likely that CPython is not going to ever throw out its existing work in favour of a different implementation.

FWIW, parallel implementations already exist, and maybe RustPython can join them.