Exactly, and at this point, the only benefit of adding more cores is that things will be somewhat smoother when there are more things open, but even then, it's not much of an improvement. Although, I've heard of plans of CPU companies making dual-core chips with 2 other cores that are low-powered and are used when the device is in sleep mode, thus making the battery consumption more efficient.
I've heard that, too. Gerry and Phil talked a little about it in the podcast recently. The extra cores could mean big improvements in battery life.