iPhoneOS is OS X with a Cocoa Touch GUI. They are at the core essentially the same OS. They are not different from each other, just two different optimized interfaces for their target markets. I don't know how many times I can say it in different ways. iPhoneOS = OS X + Cocoa Touch. You can't have one without the other.
how come every time one of these types of thread comes up some "smart guy" has to come along and try and explain the difference between the term "OS" and "GUI"
you do not need to say it any more, because we ARE TALKING ABOUT INTERFACE, not some strict definition of what "Operating System" is.
and from an interface point of view the iPhone OS and OS X are completely different, and I do not know how many times I need to say THAT.
from an interface point of view, "iPhoneOS = OS X + Cocoa Touch" is completely false.
So it doesnt make a whole lotta sense for them to continue on with Mac OS 11 (or whatever it would be called).
agree with most of what you say, but as long as there are enough people that are power users, or want to pretend to be power users, there will still be OS X, I do not think it will go away, just be less important.