I think that expansion would be a great idea...... afterall we now live in a "global village", and the major sports played around the world could become much more global in status than localised as sports such as Gridion and Australian Rules Football presently are.
This has already been done successfully with other sports.
In Rugby Union in our part of the world there is a major southern hemisphere competition called the "tri -Nations series, where teams from South Africa, Australia and New Zealand compete at a high level. (Australia has three teams in this competition from Queensland, New South Wales and the ACT. Likewise there are teams from NZ and SA provinces as well) Europe has a similar competition as well, which in recent times has elevated England to a world champion status. (We intend to reverse that ASAP)
In Soccer (Football to the purists

) there are already teams from major clubs playing in leagues in both Europe and in Asia. Again from an Australian perspective, we have two or three teams in the Asia League which has helped to develop the standard of soccer in our country...... to the extent that the Socceroo's (The Australian National team) can no longer be taken lightly on the world stage (World Cup & Olympics etc)
I could envisage a world basketball competition or at least a number of world regional Basketball competitions. I'm sure e.g. that we (in Australia) would definately benifit from having a team say playing in the NBA in the US...... judging by the number of Australians already playing in NBA and US College teams..... we could certainly field a team that would be extremely competitive in that league which would be probably the toughest Basketball competition in the world.