I thought OP was very clear about the serious business reasons they see for US startups to make an earlier and more serious commitment to Android:
1. You will need Android support eventually (to go global, because users demand it, etc.).
2. If you try to add Android support later, you'll screw it up in ways that will be difficult to fix (e.g. porting iOS apps too slavishly, not taking advantage of Android-specific platform benefits, building a corporate culture that treats Android as second-class, etc.), especially since most of the best Android talent will want nothing to do with you.
1. You will need Android support eventually (to go global, because users demand it, etc.).
2. If you try to add Android support later, you'll screw it up in ways that will be difficult to fix (e.g. porting iOS apps too slavishly, not taking advantage of Android-specific platform benefits, building a corporate culture that treats Android as second-class, etc.), especially since most of the best Android talent will want nothing to do with you.