From my perspective (as someone who hasn't lived in the area full time since 1981): Congel turned an ugly (brownfield) area of Syracuse into something much easier on the eyes. Huge Retail Mall>>>Oil Tanks and Salvage Yards. His Mall has helped bring a varied choice of retail, dining and entertainment that wouldn't be here without his Mall. The Lodging industry in Onondaga County has increased to support the Mall. That is bringing in taxes. We have more Canadians and Upstate NY'ers than ever shopping in the area.
You really want to create synergy and efficiency? Put the Dome between Downtown and the Mall (Kennedy SQ works too but not as well IMHO). Link it with light rail (University, Downtown, Stadium, Mall, Baseball Stadium/regional Market/Train Station, Airport).
Industry is never coming back until NY State changes their work and tax policies. I don't see it happening as NYC is doing well in finance and could care less about Industry in Upstate.