(Not the parent poster.) I've looked at it and think it looks interesting, but I think Ethereum may be approaching something like JavaScript's status, now. It's not necessarily technically ideal, but it has first-mover advantage, tons of network effects, and an entrenched position, so it might have already won.

I think there's a decent chance they may eventually pivot a bit and rebrand Polkadot or Substrate as an Ethereum layer 2 platform. They already seem to be leaning in that direction a bit.