The reason the community is against multiplayer is that X is very much a game about ownership. A lot of players build massive complexes in space that take dozens, if not hundreds, of hours to set up and get their trade routes optimized.
Playing mp would mean some shitheel can come into your universe and blow up all your shit.
Ego's been working on and off on X-Online, but I don't think it's ever really going anywhere. It's just a single player game.