It's more of a hassle to bring my wallet than to bring my ipad around wherever I may go.
I bought the original mini when it came out, and while it was very light and easy to carry, I kept missing the bigger screen. Almost everything is easier on a bigger screen -- text is easier to read, games are easier to play, videos are more immersive, keyboard is easier to type. The only advantage the mini had over the iPad 3 was weight. The Air reduced the weight just enough that for me, it's no longer worth it to compromise on all the other things when I can just carry the Air.
I bought the original mini when it came out, and while it was very light and easy to carry, I kept missing the bigger screen. Almost everything is easier on a bigger screen -- text is easier to read, games are easier to play, videos are more immersive, keyboard is easier to type. The only advantage the mini had over the iPad 3 was weight. The Air reduced the weight just enough that for me, it's no longer worth it to compromise on all the other things when I can just carry the Air.