The other niche languages are either buggy, slow, or both. Jai won't be. Ultimately it's about taste and quality. If the language gets enough right then people will switch to it, because people are desperate for a c++ alternative. Open sourcing or early access won't help here. Somebody just has to do the hard work of writing the compiler internals, and it will be done when it's done. And really, I wouldn't bet against somebody who has delivered on big projects twice before.