Yes, with procedurally generated SS the community will totally break apart. There will be no background story, no myths, no lore for the game. The wiki will only be about orbital mechanics and parts. Watching or reading one's stories of challenge and success will have little to no relation to others. This seed number will break the community into the number of possible seeds. Little to no one will waste his time going through the whole career mode to try repeating what some other person did on some planet in his own universe. The biggest sane thing I see in expanding the current universe is making Kerbol a double star system with everything that you can infer from it.