No one will take Dalvik seriously so long as it's entirely under the purview of Google. Java just became a lot more contentious an issue with it falling into Oracle's hands. Were they to fall into the open, much like many of the tools and languages we have today, then maybe people would consider them seriously.

And even then, such isolation is really only beneficial for "App" developers who want to wash the platform out from underneath themselves, and don't care to pay attention to their tools or even understand them.

The only decent solution I see is that PNaCl stuff Google is pushing, but again, so long as it's a Google led effort it's constrained by their vested interests.

Even then, you'll still need things like Qt and have people like me clamoring for direct hardware access and natively compiled code