The claim that Python is slow is not really plausible since there are packages like Cpython out there.
Also, is Python really coming to a halt? I see no evidence of that in your article. Actually, I see no evidence of that anywhere. In fact, you only show how popular Python really is.
This does not mean that Julia won’t be a success. It’s definitely promising. But I don’t see Python going away, let alone relinquishing its arguably top spot, given its accessibility and versatility. And as you mentioned, the richness of Python’s libraries is unmatched.