I remember attending a Drupal7 release party several months ago, 11 months ago actually. It was an exciting time, all this new stuff had gotten into core. I was hoping and looking forward to using the new functionality. But then I started evaluating the status of the contributed modules and realized it wasn't going to be possible. The main blocker at that time was that Views was in a massive rewrite mode leading to Views3, and that this was causing attendant delays in other modules who were depending on Views.