Maybe because that's what Google needs its own programmers to learn right now. Although, they should make a language that's meant to eventually replace Java/Dalvik for Android as well, and a language that's very easy to use and learn.
Yeah, absolutely. Go and Dart really both fit needs of working with large software and giant scales. As I think they've both said independently, conservative design was considered a design bonus. You can see why as it gets teams up-to-speed quickly, is less off-putting to project managers, and is more likely to benefit from experience surrounding how to write effective, readable code forms.
Stuff like Rust is awesome, but no-one yet knows what an Effective Rust book might look like, and you really need that sort of solidified design understanding to work. Code is write once, read hundreds of times, so that exciting wild west of "we don't have idioms yet" simply won't fly at a big company.
One could automatically translate the Java API part of Android into Go? Also, it should be possible to write a VM for Go by extending Dalvik? I suspect that this territory is claimed by Dart, however.
