OK I get your point about pairing wanting improvement but no, putting Android into a camera is a truly horrific idea. Android is only slightly less worse than iOS in terms of user control over the device. Ever try to install your own new version of Android on a smart phone after the manufacturer moved on to new models and no longer provides updates? Talk about an exercise in nightmares. And then there's the bloatware; the last thing we need is a camera that has built in (uninstallable) facebook/twitter/instagram/wechat/snapchat/tumblr/weibo clients.
I don't think any of these are serious concerns.
Firstly, as I said Android would have to be a dual OS that you'd choose to boot into as and when you need it. If it comes to a point in five years or more time when this specific version of Android is no longer supported by Google for security updates and Canon has also stopped providing updates you could simply chose not to start Android on it and keep it running within the standard Canon OS.
I don't think installing a custom version of Android on a phone is any harder than installing a custom firmware (eg magic lantern) on a camera. And for the same reasons that's something only 1% of people would do.
I don't know any phone (at least not from a reputable source) that has unstallable facebook/twitter/instagram/wechat etc clients. I know that if Canon are expecting this new format to take off they'd be very aware of how such things would look to reviewers so I'd be pretty certain that the only uninstallable stuff on there would be the stuff that is directly required to integrate with the camera.
And maybe the camera only needs one card slot if it can sync photos with your Amazon Photos/Google Photos/Dropbox etc on the fly in the background
My one concern about this idea, and something that could kill the android idea dead, is the ergonomics of using an on-screen keyboard with it - especially if a heavy lens is attached!