Actually these same indoor faciities are used for a multiple range of sports, not just Basketball, just look at the markings on the floors. The same venues are used for Netball, Volleyball, Badminton, as well as diverse non court sports such as Karate, Tae Kwan Do, Bocce, Indoor Soccer, etc, etc.
The problem is that over the past 20 years or so, a lot of very average venues have been built, instead of fewer quality venues. What is needed is more quality venues such as the Golden Grove complex which is shared by a multi-school site and the community. I have never been into Starplex but I believe that is a similar situation where it is shared with Trinity College.
Then again, I used to play School and Church basketball outside in the rain, played on the old cement Number 2 court at Forrestville for a season or two, trained and played at Marion Stadium when it was a real tin shed, and the list of the 60-70s venues goes on. I did have one season of playing at the newly opened Appolo Stadium so it wasnt all bad.
The only one of these venues that had any Government support was .... well actually none of them. So don't blame the Rann Government or the current Federal Labour Government, it has been the same for 40 years by both parties. The only real funding assistance was for The Dome, when the Government needed an additional stadium for the 1998 Commonwealth Games bid and even then, it was only a loan guarantee.