With the roles above, is SC going to be that deep? ie. to offer roles such as diplomats, manager, scouts etc.? It just seem a lot to offer in a game. Maybe its just me being doubtful but during the past year ive seen quite a few games not live up to the hype - so I learning to be careful.
These roles are hardly anything that the game mechanics will provide (especially since every guild has different needs) but something that should be part of the guild's structure planning. It's not like any game mechanics could "make you" a certain role anyways, but it's your actions to actually perform those tasks. All we need is a free guild title/rank system, preferrably with guild asset control and access rights - these basics I am sure will be covered in a space game that boasts guilds to own sectors and players owning multiple stations personally already.
So, I see no problem here - such structures even worked in old Ultima Online, it's all about living/playing them.