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That would suck, because then we would be forever forced to use ancient versions, because 2% of our customers are on Windows 95.

A much better model would be a progressive enhancement, where we can deliver optional types that browsers can then use if they understand them. That way there will also be a reason to upgrade for users.

As much as I love the idea of letting the browser do some crazy optimization with native types -- I don't think it will ever happen. Or perhaps maybe it shouldn't happen.

The only reason TS is able to iterate so quickly is because of the compilation cycle. Without it, progress forward would probably come to a screeching halt.

Yup, with https://webassembly.org/

Not only TypeScript, one day we would be able to compile Haskell as well: https://github.com/WebGHC