This is all about product differentiation. iOS/iPad/iPhone have a very specific meaning and market position, and OS X/Mac have a very specific meaning and market position. Regardless of the technical possibilities/impracticalities, Apple benefits by keeping the two product lines separate and distinct.
There are probably more iOS users (and deployers) who would run the other way from an iPad running OS X as there are OS X users who yearn for an iPad-like device that runs OS X.
My simple message to those who want an iPad that runs OS X... give it up. Sooner or later, you'll get a Mac that more closely resembles an iPad. The number of people who truly need a device that runs both OSes is too small. iCloud is, and by that name or another, will continue to be the bridge between operating systems.
There are probably more iOS users (and deployers) who would run the other way from an iPad running OS X as there are OS X users who yearn for an iPad-like device that runs OS X.
My simple message to those who want an iPad that runs OS X... give it up. Sooner or later, you'll get a Mac that more closely resembles an iPad. The number of people who truly need a device that runs both OSes is too small. iCloud is, and by that name or another, will continue to be the bridge between operating systems.