Just because it's the latest kool aid tech, doesn't mean it's legacy; it often feels like it becomes legacy as the people pushing it leave.
But this is why technological choices need to be taken with care, and if you're in a managerial position, you should only agree on using new tech if there's dedication / guarantees for the ones pushing it, a healthy labour market, or budget to provide training for people that don't know it yet.
And that's why so much is still 'boring' languages like Java, .NET, PHP and Javascript instead of Rust or what have you.
I'm a Go fan though and will exclude that, as IMO Go is by design easy to learn by anyone.
