You don't need Julia. Julia was trying to be a better python. We will have better python in form of Mojo.
Mojo also owes part of its design from the lessons it took from Julia (as per Chris Lattner [1]).
I really do wish it were open source already though. I know they have laid out a roadmap for opening the source.
It gives real “Jony Ive leaving Apple to go work somewhere where nobody can tell him ‘no’ “ vibes.