Another goal might be asserting political influence in systems:
What David Braben means in his QA about why the shared, living galaxy is absolutely necessary or else the game would be "empty" and it would suck. I'm not quite sure what this is going to be, a story / campaign consisting of missions that are released overtime, or just a background simulation.
If you do want to for example make sure that the eriani communist are left alone by the fascist federal plutocracy war machine, you are forced into a guild. You need to organize with other players to reach your goal. Alone you can't influence anything.
So here the lone wolf already lost. You won't be able to pursue this type of gameplay goal alone.
As I understand it (big disclaimer there

), changes in Elite Dangerous (political or otherwise) are supposed to *generally* be initiated by the event system, which then can be influenced by picking a side, and doing missions related to that event. Some events might be conditional and trigger by themselves, others will have to be manually injected, in order to create certain situations related to more abstract material that goes above the level of simulation the game is capable of. There is no forced organisation or grouping involved however. The outcome will be based on the overall activity generated for the sides appearing in that location, or related locations, where more interest and support for one side, surely might not be so good for the other. But this very much involves the lone wolf, since he is part of that final number that is looked at, when the event has reached the appropriate stage to move on. (It might be that they also just want to inject material completely on the side of the event system, that is in fact called "adding content/patching the game with new material", just to answer/talk to myself.)
It is the contextualisation of these events that create the stories, so to speak. Unless there is something here I've missed.