I my household we have a happy messy mix of iPhones, iPads, a Mac Mini (media server and security cam recorder) and a 2010 MBP. I find I still use the lappy as my primary system and "second screen" for my massive amount of TV watching. But the iPad Air and iPad 4 are still in that mix every day. My wife has the Air and uses it constantly since I rarely give up the MBP. For now this mix works perfectly. In the future I'm not sure what we'll use as the MBP ages.