Seems to me that the lack of a Google blessed tablet has a lot to do with why we're not seeing much in the tablet optimized app front. We need a stable development platform that's going to get updates at a reasonable clip. I don't want to have to buy a pile of devices or discard them left and right so I can dev on newer versions.
There are other reasons why tab apps are few and far between as well, but not having an n1 equivalent tablet held me back. I gave up waiting and bought a tf prime in December and am finally working on a tablet specific app, but I wonder how long before I'll have to replace it.