I use Rust and C at work. I quite enjoy Rust, but I currently have no reason to believe C won't outlive it, by a lot.
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My reaction is kind of: "So what?" I really don't care about the relative lives of languages and don't really understand why anyone would. Unless I am wrong, there is still lots of COBOL we wish wasn't COBOL? And that reality doesn't sound like a celebration of COBOL?
IMHO it would be completely amazing if magically something 10x better than Rust came along tomorrow, and I'd bet most Rust people would agree. Death should be welcomed after a well lived life.
To me, the more interesting question is -- what if efforts like c2rust, Eurydice, TRACTOR and/or LLMs make translations more automatic and idiomatic? Maybe C will exist, but no one will be "writing" C in 20 years? Perhaps C persists like the COBOL zombie? Perhaps this zombification is a fate worse than death? Perhaps C becomes like Latin. Something students loath and are completely bored with, but are forced to learn simply as the ancient interface language for the next millennia.
Is that winning? I'd much rather people were excited about tech/a language/a business/vibrant community, than, whatever it is, simply persisted, and sometimes I wish certain C people could see that.
C has never been a particularly good language, and is so good that finally (with tons of pushbacks!) there is an alternative that make the case so strong that is at least considered the possibility that will come the very happy day where C will be our past.
The only, true, real blocker is that C is the ABI. But if we consider the possibility that C can AND should be the past, then the C Abi can finally adds sophisticated things like Strings and such, and maybe dreaming, algebraic types (ie: the C will be improved with the required features so it can evolve the ABI, but not because will be a good language for write it (manually) on it).
And to reiterate: C should finally be a real assembly language, something we not need to worry about.
Assembly is used quite a lot and if you're a programmer Assembly is very valuable to know _at least_ how to understand it.
I disagree, also, that C should go away. Saying it was never a good language is a bit harsh. It's a great language. One that industries are built on. I'd rather read/write C code than, say, Rust.
Edit: There are, of course, languages coming up that can absolutely compete with C. Zig could be one when it's mature, for instance.