Making Ruby 3 times faster is not going to save it

Adding something akin to Guilds it could give it a nice advantage if implemented nicely.

the Ruby ecosystem seems stale and lacking fresh ideas

I think that's mostly because it's not the new shiny toy what it's missing is some sort of cohesion to push it forward.

Maybe, I'm just biased but even with languages like Elixir - I keep coming back to Ruby.