If this is a great hit, (Which I think it will be) have you guys ever considered maybe taking this format to a constant online world? Not an MMO because it would be no way an MMO, but a system of maps that could be played and while the player was gone others in his faction could take over or maybe AI that would defend accordingly, but you wouldn't have offensive till you logged on.
I can see the issues of people who play more, but then again if you own just a tibit of a galaxy, it would then do you more to work with others etc. Eh, I know it would be allot of work, but I could see that being the next step

I have seen other games that have come out attempting to do so, all of them did poor thou, bad designs/graphics etc had allot to do with it, but nothing exactly like this thou. Some would say EVE, but na EVE is single ship MMO type stuff, I am thinking this game on a persistence universe