Something tells me the iPad 2 is the "sweet spot" in Apple's iPad lineup. I use my iPad mainly for surfing the web, tweeting, sending e-mails and posting comments in forums mostly. I don't use it for gaming. Thus, I think the retina display is pretty frivolous. To be honest, I can't tell the difference between a retina display and the 1024 x 768 display on my iPad 2.
I also heard that the iPad 2 has the longest battery life of all the iPads at 11 hours! Something tells me this is why Apple continues to keep the iPad 2 for sale in it's retail locations.