I owned an original iPad, then original iPad with 3G, then iPad 2, now iPad 3.
I am purchasing the iPad mini for 2 reasons: first to continue the lightning connector transition and secondly, my kids have been more frequently using the ipad for their daily use, so I want to see how they react when i throw the mini into the mix. $329 each is way cheaper than a $999 Macbook.
I could get each kid an iPad Mini for the cost of replacing one laptop. Yeah i dont care who you are, thats a win situation. Anyone who still owns their iPad 2 isn't complaining because the iPad 3 and 4 made them unuseable. It still functions just fine for browing, email, etc.
And to be honest, the iPad 3 gets a bit heavy after holding it for a while.
Yes i understand it doesnt have a retina display, i think we all know that. But its the same resolution as the iPad 2 squeezed into a smaller screen, therefore the pixels are more dense. I think it will feel like an iPod Touch retina display, It looks crisp but its still missing that little extra to make it AMAZING, but really, i'm more amazed by the 4S and 5 screens than i am the iPad 3. so I really think the retina will be a non-issue once its in the wild.
Retina will come with iPad Mini 2, we all know that. so you simply sell your ipad mini or pass it down. Most of us by the newest iDevice when it comes out anyway.
I will be keeping the iPad 3 alongside the iPad Mini for the time being. f the iPad Mini is a huge success for my household's needs then i will sell the iPad 3 and get more Minis.