Retro emulation on Android isn't going to go away, regardless of how questionable and legally dubious it is. However, the exploits of a hacker by the name of alpinedelta prove that even those who resort to playing ROMs on their phone often yearn for the feel of the real thing.
alpinedelta has taken the insides of a Wii Remote and placed them into a gutted Game Boy case. Because there are apps on Android which allow you to control your phone using the Wii Remote over a Bluetooth wireless connection, the device functions just like the real thing - right down to the fact that you can't play games which use more than two buttons.
Even so, it's one of the coolest hack-jobs we've seen in a while.