Sure it's possible, but this is not the way chip design is going. Despite IBM's PowerPC for the Xbox 360, chips cores will probably multiply in counts of 2. (2, 4, 6, 8, etc)
This is not fact, so please don't take it as such. Currently, to my knowledge, Intel and AMD only have quad cores on their roadmaps. So I'm just speculating on sextuplet and octuplet cores.
Anyways, no one has 3 core processors on their roadmaps.
-mpjesse