So just make the chips bigger... I don't see a problem with that. Make the chip the size of current motherboards for all I care... Just make faster chips, whatever it takes. :laugh1:
Two problems:
Speed of light. If a signal can't get from one end of the chip to the other in a clock cycle, you effectively have to start designing asynchroneous / clockless systems for starters. But more importantly our current programming model starts falling apart and every app that wants to take advantage of it will need to work like a large distributed system with all the complexities that involves.
Heat. Pumping heat away fast enough is the biggest current problem to upping clock speed. E.g. with custom (read: expensive) cooling, doubling to tripling current clock frequencies is doable, but you end up with a cooling system that's many times larger than the CPU with current tech.
So at some point we'll need to figure out smarter approaches instead of just throwing more transistors at the performance problem.
