What will happen to the AT&T network when the iPad starts selling?

We all know that the AT&T network is having difficulty keeping up with the data load caused by a multitude of iPhone users. What will happen when the iPad becomes available? Will the networks get more congested? Will AT&T have the necessary infrastructure to provide adequate 3G services for all these new iPads that will be floating around?

It's really a shame that Apple isn't actively expanding their iPhone or iPad to other networks like Verizon.   We've all heard rumors that the iPhone will be coming to Verizon, but are these rumors real? When will it happen? In 2010? In 2 or 5 years?

My wife is eagerly waiting for the Verizon iPhone. I gave up on that when Apple didn't announce a Verizon iPhone in January. Let's see how AT&T will keep up with all the customer demands created by the iPhone and iPad.