Blair still has a long way to go, and as much as I like Blair, Haywood fills a need that can help the Spurs now.
Blair is signed for the next 2 or 3 years, so he'll still have time to grow to help the team the next few years.
Like I said, how do any of us know if Blair will be out there when the season picks up and the playoffs roll around? Hill wasn't last year, even though a lot of people thought he should have been.
And, through all of this, Blair is fun to watch and provides great energy, but he is still a rookie.