Have you even tried developing for BB10?

Converting a mobile webapp to BB10 to native app takes merely few hours. BB10 supports Phonegap out of the box (their dev tools have simulator for it). They have their own version of something very similar to Phonegap but a little richer. You can port any Phonegap app to BB10 and use their JS API's for deeper integration.

BB10 is RIM betting on HTML5 for native apps as well. If they can optimize the experience nearly as good as native Java apps - this could be the next tide. You gotta look at the future where developing for 5-6 platforms would be a pain. Microsoft is betting on similar approach for Windows 8.

Win is at the next tide - not the one that Apple rode 5 years ago.