It depends on whether or not the same chip is also the chip processing camera frames as well.
There is often a down facing lo resolution camera looking for a pattern on the ground it can lock to,
and a forward facing camera, and something controlling a wifi module.
A number of chips would make things easier, but the bigger the PCB the more weight the copter has.

If I were building one, I'd start with the Parrot Drone, and it's hardware, and try to improve it's
software and/or hardware.
The chip codes, and iPad/iPhone/Androind source is all open source to begin with.

It is jus the physical copter hardware that is lacking.. it's a bit weak.