The 49ers bring entertainment but the stadium built at the new location hasn't really brought much to the local community aside from lots of traffic on Sundays. I lived right next to the stadium for several years and there's been next to no commercial development nor housing development. Anyone who goes to the 49ers game has to drive to DTSJ to continue the party. I don't know if it's the result of NIMBYs or the local government, but the stadium has brought nothing to the local community (maybe to the pockets of the mayor and the admins who approved it however).