What's the problem? you have the source, nothing is stopping anybody from using python2. In fact from that perspective you could say it is a good thing, once python3 was published, the language python2 became more and more stable. Until we are at this point. The language is super stable. It will never change again. exactly what you wanted.
This is the main difference between trying to get some ancient code written in C working vs "modern" toolchains - if you have the compiler and the code for C, everything is self-contained; many things like python2 download absolutely tons of support code and libraries to "build" - and when those go offline you can't easily build anymore; and you can't even say "this here VM will build this forever" unless you make sure that it will continue to work (and everything is separately cached/downloaded).
