Dart could compile to bitcode and then it would execute at near native speeds. Even stuff like asm.js that is an optimized usecase for machine generated js is still a workaround of the fundamental issue - the lack of a lower level alternative.
The weird thing is Google already support this for Renderscript, but not the NDK where it would be most useful. Encourage people to compile to LLVM and new architectures becomes much less of an issue.
That isn't to say Tesla will solve all these problems (I'd be especially worried about the cost of servicing what's essentially a computer on wheels), but at least they charge a price and you know what you're getting. No negotiations. No oily salesman pitching stuff you don't need.
So that shiny new 4K monitor may end up delivering an inferior desktop experience and requires a GPU working 4x as hard. That might change as more desktop apps become high dpi aware but obviously any legacy app is never going to get fixed.