The Federation has been expanding over a time span of 2 centuries starting with the foundation by 4 worlds (Earth, Vulcan, Andor and Tellar).
Over time more worlds keep joining the organisation, as we all know, to the point where the Federation spans 8000 light years and hundreds of member worlds with no sign of the Federation stopping to incorporate more worlds.
Since the Federation is not an Empire with a minority ruling class, but a collaboration of equal status worlds with democratically elected representatives, how big can it become before its political structure collapses or becomes incapable of acting?
1000 worlds? 5000?
There must be a point where it becomes practically impossible to satisfy the needs and serve the interests of every member world and I think sedition of some worlds becomes inevitable.
What are your thoughts on this?