Not to mention the dependencies. Most of the "dependencies" of bash scripts are widely used unix tools or other scripts which are generally fairly stable. The python I've been exposed to (I don't know how typical this is) uses random pip modules that are already deprecated and will never be upgraded to python 3, if pip itself even exists and is compatible with packages made today.

To know if something will work in 50 years you have to look at the weakest links and that's not necessarily the language.