heh
A64 already has memory controller built in

someday it will have HDD controller built in too perhaps

cant have graphics built in unless its a mainstream graphics technology because ppl still want the option and the upgradibility of a seperate graphics and sound cards

from a cost point of view, it still might be cheaper now to have the chipsets on the mobo instead of in the CPU
and sockets arent that fast yet
we need BGA!