They should call it Mac OS 1
Because, at least on my clock, that's the first number after one rotation.
Calling the OS 1 would be a bold move too. It would signify the switch and re-birth of the OS.
When the mass population hears Mac OS 11.... they're going to think... hmm, okay that makes sense, 11 comes after 10, 9, 8, etc...
Very easy to mix them all together. That's why when I talk to my PC friends I say Mac OS "X" (the letter not the number). Then they say "what OS is that?"
Then I can tell them how different it is from Mac OS9.
Even though it was Mac OS 10, a lot of people called it Mac OSx. So it seems to me that some people might think Mac OS11, isn't that big of a deal at all once they forget about Mac OSx.
Apple has done a poor job switching people to OSx. They are expecting the "buzz" of Unix to sell the OS, and up until now it has. But now it's time to think of the long haul. Maybe their gearing up for that. Seems like this "Switch" phylosophy could easily turn into "and here's why" dogma.
"The only OS, the 'One' OS... Mac OS 1"