I think what will happen is we'll see ios continue to mature and gain more 'laptop-like' capabilities. That may include some kind of trackpad style support. I don't think we're going to see a true iOS/OS X hybrid for some years, if ever, given Apple's stance on the matter ... but as I adjust to using my iPad Air 2 with ios 9 in conjunction with an Apple wireless keyboard, I find myself wondering how much it matters.
I had a Surface 3 for a week. I loved it as hardware, but the software experience had me pining for my iPad almost at once. For me, the supposed 'power' of a full desktop OS did not compensate for disadvantages; I no longer enjoy tinkering with computers simply for the sake of tinkering, and it seemed to me that Windows has become a tinkery operating system. I don't want to have to dive into regedit to make my touchscreen better, I don't want to have to faff around with anti-virus, and I absolutely don't want to find myself anxiously watching Task Manager when the system seems to slow to a crawl! All I wanted from a Surface 3 was a good tablet that could be a laptop that allowed me to browse, research, write and upload on the go in a package that was lighter than my rMBP. For me, it failed.
By contrast, the Air 2/ios 9/wireless keyboard combo is perfect. It's a great tablet, but with the keyboard it's fantastic for writing and surfing, thanks to all the support for keyboard shortcuts—and yes, you can use a variety of keys to navigate a web page including the arrows, cmd-arrow, and space bar. It's not as nice a scrolling experience as your fingers because there's a noticeable jerk but it can be done. I'm looking forward to getting a proper stylus and using the ipad for notetaking et al as well.
I would like to see:
*trackpad support
*more transparent sharing of files between apps. There's still too much round-tripping going on.
*The option to save files into iCloud Drive direct from Safari, rather than dropbox etc—especially for pdfs.
*The ability to use the arrow keys on a physical keyboard to navigate between search results in Spotlight