I don't know about the average Android user, but I imagine you'd get a lot of users.
I don't really use Apple products, but I do have lots of friends/family that I can't convince to use anything other than iMessage to chat on their phone. I'd literally be the only contact they'd bother talking to not on iMessage. So right now, our experience sending pictures/videos is pretty terrible. I'd install iMessage on my Android device in a heartbeat if it meant I could actually send decently sized photos and videos to them. Doubly so if it meant I could actually participate in their Facetime calls and they could easily Facetime me.
I don't really use Apple products, but I do have lots of friends/family that I can't convince to use anything other than iMessage to chat on their phone. I'd literally be the only contact they'd bother talking to not on iMessage. So right now, our experience sending pictures/videos is pretty terrible. I'd install iMessage on my Android device in a heartbeat if it meant I could actually send decently sized photos and videos to them. Doubly so if it meant I could actually participate in their Facetime calls and they could easily Facetime me.