[dstein]

You're comparing apples to oranges. New programming languages are great, but it's a very different problem domain than web UI interfaces.

[babel17]

Nope, it isn't. Yes, Babel-17 is nowhere near to be used for UI on all platforms. Yet. These days people underestimate the power of languages, saying "it's all about libraries". Libraries are nice, but you can get better libraries with better languages.