Yes but why bother being on hardware that doesn't want you? I mean, don't get me wrong... my personal phone has always been iPhone since the original and I prefer iOS hands down (I use an android too daily as my small business phone but meh don't care for it). But you can get android devices for 20-50$ that would be more than adequate for being a nice little dedicated unit for your Atari(s).
First off, I want to say this is a really cool project and I'm excited to try it!
I'm both an iOS and Android user and have considerable experience on both platforms. My personal bias is towards iOS but I think both platforms have their strengths and weaknesses.
The primary reason I'd suggest supporting iOS as well as Android -- the iOS Bluetooth stack is WAY more stable than the Android one if we're talking Android versions as far back as 2.2. This is especially apparent with regards to Bluetooth LE even in the latest Android releases (although I assume this project is Bluetooth Classic given that it is supporting Android 2.2). I speak from experience on this :-)
However, I wouldn't go so far as requiring iTunes to get disk images to the phone. A number of apps allow you to run an embedded web server directly on the phone for purposes of uploading files. The Z-machine interpreter "Frotz" comes to mind as an example of a released app that can take "ROMs" in this manner so I don't think getting such an app into the App Store will be an issue.
When this becomes public, I'd consider helping out and porting it to iOS if there is desire to do so.
Edited by Farb, Tue Aug 19, 2014 12:24 PM.