Scala "failed" for two reasons: Firstly, (like Haskell) it quickly exceeded its weirdness budget, and cultivated a community that embraced and sustained that weirdness. Secondly, a number of prominent individuals publicly expressed political views that made it hard for engineers in "mainstream" organisations to loudly promote Scala.

I think Rust is doing much better on both fronts. It has always been a more pragmatic language than Scala, and the way it is developed supports that, rather than pushing the weirdness budget higher. The overall political lean of the Rust community is also more amenable to support in mainstream institutions + companies.