I would say never say never in this world, maybe someone will come up with a new framework that merges best features of others, then it will replace the older ones.
Generally agree, although I'd argue with it being a key component in operating systems. Rust still accounts for very little, although increasing part of OS codebases.
Rust is certainly part of the Linux kernel, famously, and I believe also Windows and Android, if not macOS. Not a _large_ part, I dare say, but that's not the claim.
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