This system:

Meant a lot more people could be useful with stone management/wars, etc. Also good war/alliance system. Could set wars to run indefinitely, for a time scale, for a kill total win, etc.
Negative = only 'grandfathered' guild stones existed, and only then just as an unusable object. After SE you started a guild and accessed guild functions from a paperdoll gump rather than by buying & using a guild stone. New (SE) system could possibly be changed to work with guild stones as well?