Exactly. See the future. There's already been rumors of OS X being developed to also run on ARM processors. If there is an iPad 3 with Retina display, it will be a screen that is currently much higher resolution than the laptop line. If you could run OS X on that hardware too, you could have a hybrid device: iOS for the content consumers, OS X for the content creators. Bluetooth keyboard & mouse and you have a super portable laptop when you need a laptop and tablet when you need a tablet. When talking about A6 Quad Core rumors, people are already asking why they need quad core power in iDevices.
Now, if all that comes together, iMacs of the future could further thin down and what do you have? Lion already appears to be pointing toward multi-touch Macs. If you can run widgets in a dedicated screen, how long until you could run iOS apps in a dedicated screen? Macs get options to run iOS apps and iDevices get options to run Mac apps. Imagine that!