There's also the tired sysadmin crowd who are tired of rebooting thousands of hosts for kernel, shell, libc, etc. patches. And tired of patching web, mail, dns, etc servers. I'm sure there are really smart C and/or C++ developers out there that never make mistakes but I've spent a large part of my career patching/upgrading really smart peoples code.

For me, safety is the killer feature in Rust. It's also exciting because it brings systems level programming to a new generation of programmers without all the risk.