In my opinion, i don't think Apple would switch to Intel soon unless the need really arises, which doesn't seem likely. Considering the magnitude of manufacture of apple products, they should consider their own microprocessor development unit as an option to help save on cost in future.
Jer from motivational posters
Steve Jobs is apparently suffering from Cancer, which is a terminal illness in many of the cases. Will planned apple products go ahead with production if something happens to him?
I need to make a demotivational posters in this context.
November 3, 2003: No Need for Intel
Eleven Apple Predictions for 2011