Maybe it's too polarizing as GP phrased it, but my anecdotal experience with two of the items you mentioned is wait and see, and having some early investment to not miss anything. C++ is still the safer bet, esp if you factor in the long term non-technical aspects like reliably finding talent, onboarding, and so on.

My 2c: rust productivity seems to be behind that of C++ atm (which is not surprising given the different maturity).