I hope too, maybe with iPad Pros first: A new hybrid binary for apps that allows you to seamlessly switch between MacOS mode when connected to peripherals and iOS when not, apps just render in a different place, but maintain state.
There are some practical issues with having to make sure you have the screen and keyboard access (in practice the all-in-one of a laptop is pretty handy - though I guess you could still have this form factor in a much lighter shell minus the compute) but for a lot of cases like home <-> office this would be the dream, just carry your computer in your pocket.
The RAM shortage is only starting to hit but I think this could potentially start to be more appealing if it lasts too long and gets too bad.