They key point for me, and one that is often not taken into consideration, is that it is easier to make a game that does A and another game that does B, than a game that does both A and B. And when you expand that to A til F, it becomes MUCH more difficult to do it in one game. I'd love if they could add a Hellion to ED. Or, alternatively, if they could add ED to Hellion.

In truth, I dont believe for a second it is actually feasible at this time, and attempts at this either have failed (X:R, EvE) or are failing (SC). At some point its best to consider that all these attempts may have failed because we want too much, rather than that everyone who tried is incompetent at performing this doable task.