I'd have thought so but my daughters prefer their Chromebooks to their Nooks running CyanogenMod. Part of that is the Chromebooks don't have to be held: the screen can be adjusted to the proper angle without a stand. They're sprawled on the floor or huddled in a chair.
Some of that is that Flash works on Chromebooks, not on tablets. Eventually Flash will be dead but there are still times that I end up closing a browser tab because I don't have Flash installed for Safari on my MacBook.
Part of it is that Chromebooks are faster than tablets. I find pages are much snappier on a Chromebook than my iPad Air. A huge chunk of that may be due to uBlock Origin on the Chromebooks and ad-blocking and tracking not available on iOS. iOS9 might make quite a difference.
Perhaps generally speaking, but there's huge overlap. I've written tens of thousands of words worth of documents on my iPad and thousands of lines of Python code (in Pythonista). I find it very convenient to use on the train. There are excellent art, animation and music apps for tablets. My kids have an iPad Mini each, but the eldest is starting secondary school soon so I expect we'll need to get her a laptop soon. I think they complement each other. For the best of both woods, use both for the things here best at. Yes I know not everyone can afford that, but that doesn't stop it being true.
Not really. The tablets also lack any kind of mouse support (well, at least iPads do). A lot of software is optimised for mouse+keyboard, ton of it is optimised for touch input, but there are not that many that support touch + keyboard.