I have a mini 2 now, I was about to get an Air 2 but decided not to. Then I decided on waiting for an Air 3 and for now I've decided not to do that either. I am in high school and would rather save up for a 13" Retina MacBook Pro for college rather than get an iPad that will be aging anyway in a couple years. I will likely look into Windows laptops as well but not until I'm seriously needing to get a computer because technology moves way too fast. With the MacBooks it is easier to pinpoint a model I want, and then watch as they just go through more generations/improvements and decide when to buy.
So pretty much my iPad isn't a necessity right now, and I don't see it being a necessity in the future, it's just a convenience. That's why I'm not going to set myself back $500 with something I don't totally need, I'll need that money for my $1500 or so computer that will definitely need to happen.