Android is pretty darn fragmented though.
I expect that aftermarket firmware would be an issue for content providers. For example, is Netflix going to allow third party firmware developers to create an app to access their content? They will already have contracts with content distributors like Lionsgate that mandate DRM in their own apps to prevent piracy.
If your aftermarket firmware doesn't support Netflix, Prime, HBO, etc then it might have limited appeal. Browser based apps might get around that in a limited way.
As for printers, I think of them as loss leaders to generate ink sales.
Don't know either space particularly well so might be wrong.