You're not technically wrong, in that Julia has the potential to replace all of those languages. And if it could attract large communities, an amazing interoperating coherent package ecosystem could develop there that's much less of a pain to use than most current systems.
But I don't think either of those are given. Projects with huge potential have unfortunately failed for "trivial" reasons like personpower, funding, approachability, etc. that have nothing to do with underlying technical merit. (edit: but, to be clear, I don't think at this point Julia can exactly "fail", that seems pretty implausible; it will definitely have a strong presence in the MATLAB-ish niche, in the sciences and in engineering. The uncertainty is about more general purpose, popular usage).
I love Julia and would love to see it succeed, but at this point in time its future is still uncertain. (And it's also unclear what if any the effect of LLM code generators is going to be - are they going to reinforce the current popular languages since those are the ones they're good at? Or are they actually going to make less popular languages more approachable, as they grow to learn to generate code in them too?)
But I don't think either of those are given. Projects with huge potential have unfortunately failed for "trivial" reasons like personpower, funding, approachability, etc. that have nothing to do with underlying technical merit. (edit: but, to be clear, I don't think at this point Julia can exactly "fail", that seems pretty implausible; it will definitely have a strong presence in the MATLAB-ish niche, in the sciences and in engineering. The uncertainty is about more general purpose, popular usage).
I love Julia and would love to see it succeed, but at this point in time its future is still uncertain. (And it's also unclear what if any the effect of LLM code generators is going to be - are they going to reinforce the current popular languages since those are the ones they're good at? Or are they actually going to make less popular languages more approachable, as they grow to learn to generate code in them too?)