chakintosh parent
The new windowing feature basically cannibalizes MacBook Air.
A Macbook Air is cheaper than an iPad Pro with a keyboard though. Not to mention you still can't run apps from outside the app store, and most of these new features we're hoping work as well as they do on MacOS, but given that background tasks had to be an API, I doubt they will.
iPad+keyboard is also awkwardly top heavy and not very well suited for lap use. That might cease to be an issue with sufficiently dense batteries bringing down the weight of the iPad though.
There's still software I can't run on an iPad which is basically the only reason I have a MacBook Air. Maybe for some a windowing system may be the push to switch but that seems doubtful to me.