I used to be quite sceptical given how Swift for Tensorflow went, however since NVidia decided to partner with Modular, alongside their ongoing CUDA JIT bindings for Python, I think Mojo might actually work out.
Apparently it had Google's money backing, for what it is worth.
I never believed into it, because Swift is as relevant as Objective-C outside NeXT/Apple's platforms, and not the kind of programming language that the research community cares about.
