I think Apple does'nt care about traditional computers, desktops, notebooks with regular OS. They realize there's no money in them, and that people don't want or need the complexity of a full blown OS. The problem with regular OS is that it cost money to support, hard to use, virus, etc. Because of the simplicity of buying software ( app store ) on iPhone/Touch/iPad platform, people are willing to buy software in large quantities. Guess what is happening to all the developers that made Mac and Windows apps, they are either moving to app store/Android store/web apps. I'm guessing in about 2 years there won't be any dev's making apps on regular OS as there's no app store/payment method. Also, it's a lot easier to develop apps on iPhone OS vs Windows/Mac.
This would be a mistake for Apple. With complexity comes flexibility and power. A full OS will be necessary for Apple's former target demographic of power users and content creators. There are plenty of computer companies and Microsoft willing and eager to fill the void left by Mac.
The iPad is a content consumption device. Maybe that's where profits are going to be biggest but I still think Apple would be making a big mistake by abandoning their core market.