I want to see more stuff like this take off
http://aethertechnician.tumblr.com/post/83141448363/flippypad-for-project-ara-have-you-heard-about
Or for Apple to make a gaming Flip phone ALA Xperia play
I think you worry too much
They already went down that road with Dynamic Hunting and failed miserably. If this takes off then it will only solidify their commitment to including the proper options and support
I think the mobile scene recognizes now that certain types of games just NEED controllers supported. Hence the infux of these types of products (and support for them) in this market
Not to mention the Unified support of accounts over several platforms (Iphone to Ipad to appletv etc..)