All Apple needs to do is make the iPad Pro into a MacOS closed system and voila. And keep their MacBooks as open.
People who want to multitask like a pro on a touch device will actually be tempted by the openness of the MacBook and might get one. And MacBook users might be tempted by the portability of the ipad and get one, even tho they might not get the full experience, most wouldn’t “replace” one with the other.