You will have your MacBook with you, but also your iPad .
Apple has plenty of chances to reduce bezels on the iPad Air en iPad Pro, reduce weight, the iPad pro can be slimmed down by 0.8 mm, etc.
There will be a time iPad and MacBook will be a hybrid device.
I have never once brought both my macbook pro or iPad Air. If I need to do simple things like check email, web browsing, I'll take the iPad Air. Everything else the laptop. But I still prefer leaving get macbook at home because of the size, the iPad Pro is the WORST of both worlds, the limitations of the iPad and the size of the laptop