The iPad mini is an overpriced, underpowered joke. The Nexus 7 is superior and costs substantially less. There's no way anyone is giving up their laptop or PC for an iPad mini.
I have a netbook and still prefer it since it has more capabilities than a tablet. Tablets are definitely outselling netbooks though, no doubt about it. Tablets are capable of doing what "most" people need/want to do which is check email, surf the web, watch vids, etc... Tablets are excellent "content consuming" devices but aren't so great at "content creation".