Wow, I am kind of torn on this. I really hate to see the coliseum moved from downtown, as I foresee it directly hurting the revitalization in the immediate area, and feel it is appropriate to have located near the convention center and the current hotels. I also fear how the Biotech Park would develop the site. I do think that the sports/entertainment complex would be a better draw for the city and surrounding region as a whole, though, and believe that it could lead to a stronger build up between downtown and Boulevard. This complex would really add to the validity of light rail along the Broad St. corridor. Perhaps if Blues Armory was renovated into a symphony hall, or such, so to draw traffic to the area still, and the old coliseum site was developed appropriately, this move could turn out to be a truely wonderful thing. I would suspect that Marriot and Hilton will lobby against this move.
Side Note: Hilton has been bought out by a company that intends to greatly improve the hotel line.