It would help, and a city like Bahia Blanca definitely deserves a venue, but as far as I know it won't be a very large stadium, something around 8500 people. I mean, it will be huge for the domestic league, but I think FIBA is looking for some monster stadiums in well connected cities, specially for final games.
But, as I think about this, I even think this whole stadiums thing is overrated. If the turks can't build the stadium for 20000 people so what? During the last world cup in Japan the games were almost empty, except for Team USA games, and in Indianapolis 2002 it was actually worse, and there were only 16 teams back then. The main income comes from TV rights.
Well, let's wait until February to see what happens. Nothing against Turkey but ...
PS=The 2010 World Cup is the last major FIBA tournament with the current 3pt line! It will be at 6.75m afterwards.