What will they think of next? If only there was some way to take advantage of all those hardware capabilities on the phone without the hassle of hooking up an Arduino. If only there was some sort of way to write 'programs' that take advantage of that hardware. But 'programs' sounds boring, we'll call them 'applications'. Wait, no...that has too many letters. I know! We'll call them 'apps'! You're gonna love 'em, they…
You're right. We don't need the Arduino, we can simply use our phone directly to control that RC car, open doors with passcodes and read the temperature of things. Oh wait, a smartphone's hardware is closed, you get what you get (in terms of sensors and control) and thats it. Hmm. It would be nice if we could extend the smartphone's hardware capabilities...
on a more serious note, I'd love to see more widespread generic HW and SW agnostic GPIO/DAQ standard. HW agnostic meaning that you could make your own boards with whatever MCU you prefer, and interface it with whatever. SW agnostic so that it would work with Windows, Linux, Android, OSX, iOS etc painlessly.