Total downgrade unless you require a smaller device. But one would ask why you picked a 9" tablet over a smaller Kindle or Playbook?
Just entertaining the thought, not saying I will do it. Kindle or Playbook...I just threw up! I prefer Apple products and the iPad 3 was my first tablet, iPad device. I just find the iPad mini really...really alluring.
I'll be selling my iPad 3 for the mini. The fact that it is that thin and light is an upgrade for me over the last generation processor and smaller resolution. Seriously, 0.68 lb is going to feel amazing.
And as I've mentioned in previous posts, the lack of retina display doesn't bother me too much anymore since it will be an upgrade over the iPad 2 display quality.
Edit: Oh and I also forgot, I value space greatly so the fact that it also comes with 64GB seals the deal for me.
I guess now that I have the Air I should, TBH I never liked the size of the iPad.
I'm sure I can easily get $650+ for my 32GB LTE.