Wise man once said: "Gameworld shouldnt be big, it has to feel big."
Making a gigantic world/galaxy would simply suck ass, cause I dont want to travel for many realworld months to a place and than mybe die in a second. And this dev might be speaking out of his ass, kinda like Peter Molyneux when he said to everybody:"Im gonna create the best roleplaying game in the world". And than he gave us Fable 3, which didnt even qualify as good, let alone best. -.-
But the concept is intriguing, id give it that much.