I don't understand why people are so excited for Mojo. I don't get the impression it will replace anything but computational scripting that was done previously in Python.
I don't think that's accurate. Mojo is explicitly compiling tensor graphs that run on accelerators. it's not like PyTorch where python is providing the chassis but not the engine.
I don't think its going to be a good general HPC language just because its targeting a specific set of AI workloads, but they have shown some examples of synthesizing code which is comparable to hand-written kernels.
but its not out of the question from first principles
HPC is a different beast as far as I'm aware.