I think for a large quantity of apps, that's an unnecessary choice. If your codebase isn't likely to be too large, maintaining a separate port won't be too much effort, even if you don't use some cross-platform technology. And for most "lifestyle" apps that mostly consist of a few screens, that's certainly the case. And I think for those kind of programs, the increasing popularity of Android – and especially for lower price devices – is a big boon.

If you're developing a medium- to large-size productivity app, things look quite different, and I would guess that right now the iOS "platform" would be a better choice.