GLC is currently minting 0.02441406 GLC per block. At some point the reward halving will cause it to drop to a value where the network will ignores it completely. The money supply will freeze at that point (not that it's growing by much now, anyway).

Eventually the reward subsidy calculation will wrap around and start the reward cycle again at 100 GLC, but since GLC doesn't use aggressive reward halving that could be many many years ahead.