That was brought over to the JDK six months ago. The JDK can now spawn millions of Erlang-like processes ("virtual threads") per second.
Erlang is a great inspiration and it does incredibly well with the development resources available to it, but it's hard to compete with the level of engineering investment in the JDK and its state-of-the-art GCs, optimising JIT compilers, and low-overhead in-production tracing and profiling.
No, it wouldn't. Elixir is getting really fast computation through, e.g. nx, and the user story is incredible (OS install to stable diffusion in 40 minutes, most of which is dicking around figuring out how to install CUDA). Is it easy to run stable diffusion on jvm?