[why_only_15]

The biggest thing you would probably be sacrificing is development time for every engineer involved. The html/css/js stacks have had unimaginable amounts of manpower invested, more so than any UI stack in history. This has made them much easier to learn and manipulate. Throwing away all of that would be a very hard sell.

[skohan]

I agree there would be an adoption problem for something new. But if there were a viable alternative, and people managed to build killer apps on it might be possible to draw adoption over time as people got to experience the superior performance.