The OP isn't being that unreasonable when you think about it. Maybe one day, when both OSs are more advanced, it'd actually be a good idea.
Problem is, like someone else already mentioned, when it comes to apps, iOS is the winning beast. We have 1) quality, and 2) quantity. There wouldn't be many reasons to put Android on your device at this point in time.
Maybe one day, if Android starts getting all the apps first, we'd be back where we are with OS X and Windows. But I don't know if I see that happening.