Which in many cases has already been proven by making it part of the kernel, even if Xerox, DEC/Olivetti, ETHZ, MSR projects weren't made available to wider audiences.
One can do a Google, and push it no matter what, or give up and take the adoption path that is easier to bring the safety luddites along for the ride.
For me, Rust is a nicer Ada like effort, a kind of compromise.
We can wait the usual progress rate of one funeral at a time until a new generation buys into fully managed OS, or another Google/Apple big spender forces them into developers no matter what, which most likely I will not live through.
So we're left with the compromise of allowing only userspace for managed languages, while adopting something like Rust for the "only over my dead body folks" anti any form of automatic memory management languages.
Given that even the success stories of bare metal deployments of managed runtimes doesn't change their minds anyway.
One can do a Google, and push it no matter what, or give up and take the adoption path that is easier to bring the safety luddites along for the ride.