I really should visit this forum before committing to something as I thought you where still just building the faction. At-least I had some time to read the articles and having it all sink in.
As people noted, the primary concern here is the fact that we don't want to end up with a dead setting piece. And believe me, I can understand why they don't want that. Small factions\organisations are one thing, but this group takes up a large chunk of space.
Which takes me to my biggest peeve with the Sesestran Union. It's HUGE!
It encompasses 9 systems as noted on the landing page. By comparison, a much larger group (In terms of activity) the Nepleslians have only 11 systems on their page. The two system difference is crazy when you think about the amount of players active in Nepleslia.
As Arieg noted to me that this would only be a NPC nation, it struck me as a bit odd. Why does it need so much space? Not to mention the fact that having as much space as they have now, means we will have other problems down the line (Invasions of their space by something “Evil” (Neko's, Nepleslians on a quest for more guns, etc.) can only be deflected by the power of plot. They have the upper hand in terms of players and tech.) My advice would be to take it slowly with the faction. They are a union, so adding more territories later-on isn't going to be a problem. And the interaction with these new systems and the existing one will give life to the faction.
Another point, I would advice waiting with submission of the landing page until you finished most of the faction. Right now they have some placeholder articles and that's it. I leave the finished pages to people that are more in tune with the setting them me but the faction needs a lot of work before the landing page can actually be accepted.
Judging from how people react to this submission it would be best to take heed of their concerns. The faction (in terms of size) would collapse on its own without a solid player-base. Just having two people isn't going to cut it with a faction this big.
Just my two pennies.