[lmm]

I think it will fail in the same way as Xtend or (to a certain extent) perl. It puts too much focus on one-off productivity features which results in an inconsistent language with loads of edge cases, and it doesn't have any compelling "you can't do this in Java" selling points, just a bunch of minor syntax sugar.

Ceylon has all the advantages of Kotlin, but put together a lot more coherently, and with a really compelling fundamental feature (union types).