This is EXACTLY why we can't depend on rookies to improve the team in the first year. This is prescisely why I'm disappointed that so many people have high hopes for rookies, and think our team will be better. I think the team will be worse (7-9 would be a good season IMHO), and I'm not happy about it.
Going into the offseason we needed serious help on o-line, d-line (end in particluar), and LB. The two positions we significantly addressed in FA were center and WR. We did precious little otherwise.
The moves made this offseason weren't made with any sense of urgency about winning this year. You can't do the same thing year after year and expect to improve. Nelson may end up being a great player in a few years, but if you have to limit his exposure to the field because can't block, we're screwed. Our problems at TE continue. Christ, I bet we'll even miss Robert Royal and Lonnie Johnson.
Bottom line: Potential doesn't win football games. All rookies have is potential, and can't be depended on to contribute in year one and probably not year two. Adding a center, switching a pro-bowl T for a pro-bowl WR while at the same time depending on a new batch of rookies to perform isn't a good plan to win in '09.