There are some real downsides to Dalvik/Java as a mobile toolkit, but at least the Android transition to 64-bit should be relatively smooth because there really

There are some real downsides to Dalvik/Java as a mobile toolkit, but at least the Android transition to 64-bit should be relatively smooth because there really shouldn't be too many apps out there now with the wrong assumptions about the size of ints & pointers. Native code is a different story, of course.