The chipset can add more also, but they will have higher latency. It's common on lower end systems where the CPU only has 16 or so. Those'll go to the graphics card slot (the only 16x on the small board) and all other peripherals will come off the chipset's PCIe lanes.
Definitely. They'd have to develop something entirely new to do it, which I bet would cost more than just doing a quad socketed system to get all the lanes.
