Louisville (population 720,000 in merged city/county; 1.4 M CMSA) was the first AAA baseball city to draw over one million in attendance in a season (1983 attendance 1,052,438) and even now regularly lead the International League in attendance. Also, we would've already be in the NBA after the ABA merger if our Kentucky Colonels, one of the most stable and well-run ABA franchises, had been accepted into the merged league.
The Colonels were in the top ten in combined NBA/ABA attendance and had recently won the ABA Championship, but the strong player roster (Artis Gilmore, Maurice Lucas, et al) was coveted by the NBA clubs. Dirty-dealing and collusion were the order of the day as the NBA skirted anti-trust laws in order to get as many ABA players as possible into a dispersal draft insted of accepting the ABA teams intact. Today, Louisville is well underway with several huge downtown building projects, including a 22,500-seat riverfront arena to replace venerable 20,000-seat Freedom Hall, where the University of Louisville Cardinals men's basketball program is annually in the top five in attendance nationally. And the city is beautiful, surprisingly diverse (the only thing wrong with Louisville is that it's in Kentucky, I say) and growing.
We've got the fan support...we've got the venues...we're the best-kept secret among American cities. So, let's wait until the NBA comes up to OUR standards!