So an iPad Pro running Big Sur? Combined with the Magic Keyboard, interesting... although I'd say an M1 Mac with a touch display is more likely. We'll see.
I really want a new iPad (still using an original iPad Pro 9.7") and a new MacBook (using a Pro 2016 for now) but I'd prefer a device that could replace both.
No chance, this transition is only going one way. iPadOS is coming to the Macbooks not the other way around. MacOS is the old world iOS/iPadOS is the new world for Apple.
Pains me to say it as a huge MacOS advocate but the writing is unfortunately on the wall.