That's true. It may even be more discussed here than Haskell was five years ago (though not nearly as hyped as Ruby was 15 years ago). Whether or not that's a good sign is up to interpretation, given that HN doesn't have a good record when it comes to market success and HN hype correlation. That's not surprising given that HN is more Vogue/GQ and less NY Times, i.e. it's less focused on what's happening and more on escapist wishes.
Rust is significantly more discussed than Haskell ever was. Haskell barely ever had more than a couple hundred comments / posts. Rust has thousands.
Haskell was never discussed more than Ruby or Python and you can go to the archives to prove it. This year, Rust is more popular than Ruby and Python combined for discussions on Hackernews.
Rust is insanely awesome for embedding. So you can have Python app that 90% of your team works on and embed Rust for the critical parts to optimize.
But I get your point, however Rust is one of the most discussed programming languages in the past year on HN so it must be doing something right.