BocoDragon
or, How I Learned to Stop Worrying and Realize This Assgrab is Delicious
The problem is most don't want a controller attachment for their phone. Especially is said attachment is an extra purchase. Add-on peripherals almost never achieve critical mass. Not to mention, if I am going to carry around the extra bulk of a controller for my phone I'd much rather dedicate said bulk to my handhelds (3DS and Vita).
Let's see what these iOS7 compatible controllers look like before we dismiss them outright.
I think it's about as much of a non-issue as buying a controller for your PC.