Due to demand in events for GBC circuits, it could be a great idea bring back this balls.
A lot of examples of the best modules are in this Blog, with GBC Tag:
Bricklink prices are horrible for large quantities, and new GBC builders don't have chance to have them for his first module.
I'm sure AFOL and TFOL even will pay for a set with a standard pack for a GBC module.
Even if TLC consider produce it in new colors and moulds it will be awsone rainbow coloured modules or mindstorms NXT colour sensor.
Please, leave you support in CUUSOO (Write price for 30 balls, a standard hopper capacity)