Maybe if browsers start shipping or downloading WASMs for python and others on request. And storing them for all sites going forward. Similar to how uv does it for for venvs it creates, there are standalone python version blobs.
If I could wave a magic wand to reset any programming language adoption at this point I would choose Python over Javascript.
I think Pythons execution model, deep OO behaviour, and extremely weak guarantees have done a lot of damage to the soundness and performance of the technology world.
Even more so when you consider how falsy values work in practice (data validation becomes really easy), there are a few gotchas, but in general they are pretty easily avoided in practice. JS is really good at dealing with garbage input in ways that don't blow up the world... sometimes that's a bad thing, but in practice it can also be a very good thing. But in the end it's a skill issue regarding understanding far more than a deep flaw. Not that there aren't flaws in JS... I think Date's in particular can be tough to deal with... a string vs a String instance is another.