That's missing the point. No matter if it's Python 2, 3, 4 or 5. It's so easy to read Python, that you will understand the script without effort. And even if there's no interpreter around you can just port it in a few minutes to whatever language you're using now.

If in the meantime Bash has fallen out of favor, have fun identifying what all these cryptic commands do, without having an interpreter available to check your assumption of what it's doing.

Yes, granted, Bash is more likely to stay, since it has stayed for a long time now. But given a future where there's neither Bash nor Python anymore, I'd prefer porting the Python script.