No my comment boils down to old is expensive, and at grave risk of becoming a dead end.
Your view that it's not appropriate for a systems language will come as a shock to the team writing Redox. What's impressive about that project is how quickly they've done it. From nothing to a kernel + gui in about 3 years I reckon. Took Linux a lot longer, and that simply borrowed an existing X server. It's taken Google a lot longer than that to get Fuschia as far as they have.
You don't need unsafe code across the entire kernel, and none higher up.