I thought I would look a bit further into the numbers of teams and where players come from. From NBL site, I have found out that the players origin's are as follows: -
Vic - 31 (1 team)
NSW - 21 (4 teams)
SA - 13 (1 team)
Qld - 11 (3 teams)
WA - 9 (1 team)
NZ - 7 (1 team)
Tas - 3 (0 teams)
Total 95 players
There are currently 37 overseas born players in the NBL, 28 of these from the USA.
Based on these there would appear to be enough players from Victoria to have a 2nd team based there, however the NSW & Qld teams would have to pull their fingers out a bit in developing their own players.
eg Kings have only 3 NSW born players, Hawks & Razorbacks 2, although Pirates have 5 (but they are bottom). Bullets only have 1 Queenslander, only 1 at Taipans but 4 at Crocs.
Also of interest, well to me anyway, is that Wildcats only have 3 WA born players even though there are 9 in the NBL, whereas 8 of the 13 SA born players are on the sixers roster.