I think we've crossed the point where, for most people, an iPad (or surface) makes more sense for personal use than a laptop. I have one of the recent iPad Air models and find it more enjoyable to use for everyday tasks like web browsing, light photo editing and sharing, goofing off on youtube, etc. Had I known I was going to like it so much, I probably would have sprung for the more expensive iPad Pro model with face ID, the new pencil, etc. My personal laptop mostly sits unused these days. Admittedly there are some tasks, like booking travel for example, where I still prefer to use a laptop - but those seem to be less and less of an issue over time.
For development work, I don't see my MacBook Pro going away any time soon. But I do see the iPad becoming more incorporated into my professional workflow. It sits on my desk while I'm working and I use it to run things like iTunes, email, slack, and personal reminders - where they feel like less of a distraction than when I run those things on my desktop. Integration between my macbook and ipad is already pretty great when it comes to handoff, airdrop, messages, notes, etc - and Apple seems committed to continued improvement as I think they realize that seamless integration is one of the things that makes people stick within their ecosystem.