I do not think it is the social interaction that is lacking in Disco, but the environmental interaction.
Let me explain...
A Rm fleet attacks and for the most part successfully takes over, lets say, the Texas system. What now? You cannot keep it. When you leave it is still the same.. 2 weeks from now it is still the same.
Regardless if people actively think about it, or would even admit to it, this type of environment plays on an individual's conscious.
When the environment does not change.. Then individuals tend to get pulled into a specific mindset (not everyone mind you).
The biggest and best thing that could happen to Disco would be the addition of player controlled environment. While I am not certain how hard this would be or if even possible; obviously it would not happen for small things. But larger scheduled events, such as:
Once a month, the LN and RM go to war over a system. The winner now controls the system until it is taken back, by an additional scheduled event. When I say controls the system, I mean entirely. Patrols in the system are now of the conquering faction. Pirate and opposing naval NPC's will raid it often. Bases are taken over by different factions with-in the controlling government. Martial law is declared.
Like I said, I am not sure how hard this would be... or if it is possible, or feasible. But I do know, giving individuals a stake in the game environment and a chance to actually live what will become the history and story line of Disco, will certainly improve people's ability to "get in the game".