Well, it has just been 1 day since it was released.
If I remember correctly, it took a while before content/apps really made use of the retina display on the iphone - now it's pretty much standard. Given the very large ecosystem and the large amounts of money to made, there should be pretty good confidence that development will continue in earnest.
And to be fair, some people simply can't tell the difference between the iPad 2 and the "new iPad" screens. I have come across one person so far.