Yes, Apple could easily add a 3rd party chip for lots of things.
It's obvious Steve Jobs has made a command decision to save money and hope no one will notice and/or Apple is just totally concentrating on the iPhone/iPad/iPod platforms.
Meanwhile Apple is one of the richest companies in the world and Steve Jobs is one of the richest men in the world.
It reminds me of an old quote my Dad used to say...
"You don't get rich by spending lots of money."
Of course Dad didn't have a BILLION DOLLARS in the bank like Apple though.
It kind of amazes me that while Apple has continually neglected the Mac platform with top notch graphics cards, BluRay, and now USB 3.0, and is restricting 3rd party companies on certain accessories, Mac sales continue to remain very strong.
However, a lot of that has to do with Microsoft fumbling the ball on VISTA.
If I were Steve Jobs this holiday season, I'd say grace before Thanksgiving dinner thanking Microsoft and on Christmas, I'd visit the Microsoft campus in Redmond dressed as Santa and hand out presents to every employee.