I'm aware of gorilla arm, and sure, that's an issue with an upright display... but I see no reason why you couldn't have the display on a swivel – like a drafting table. Swivel down, and the display becomes a table-top. Swivel up for traditional computer interaction.
As far as Apple licensing OS X, that seems highly unlikely given how things went during the 1990s with Apple clones.
What's important to remember is in the 1990s the Mac business was the vast majority of the then "Apple Computer" company's revenue. Today it's a small and shrinking percentage.
As far as Apple licensing OS X, that seems highly unlikely given how things went during the 1990s with Apple clones.