Right, so I was trying to make the point that Apple wouldn't have a lot of financial motivation to release a hybrid. Because right now, if someone is in the market for a MacBook ($1000) and an iPad ($1000), they have to buy both (total $2000). If they release a hybrid ($1000), that person would be able to buy just the hybrid, and Apple would lose $1000.
I think the difference with the iPhone vs. iPod situation was that people first only had the option of an iPod. Then the iPhone was introduced which negated the need for an iPod. So someone who was in the market for an iPod ($1000), instead bought an iPhone ($1000). So either way, they spent $1000. They were never at any point going to buy two devices from Apple, like they do now with MacBooks and iPads.
So I believe Apple is going to make iPads (iOS) a supplement device dependent on a Mac (OS X) in order to keep selling both devices for as long as it can. I personally don't mind this as long as they do a good job extending the Mac's productivity into the iPad. So far, I think they could do a lot better. But if they do make major improvements, it will most likely only come in the way of beefing up iOS as opposed to OS X integration. Just my assessment of the situation.