A wonderful, idealistic idea. It appeals to people's ideals. But most people aren't interested in ideas. I still think that leading is the best thing to do. Heading onward and outward to space is something worth doing, but if we wait for others to join in, it simply will never happen.
Leaders never wait to see if they're followed.
Better to endeavor on the merits of the pursuit, and when others follow, rejoice, but don't wait for them. War may make the great demands on individual courage and bravery, but it is not the reason wars are waged. Likewise, it's not the reason we'd go to the stars. Great warriors are found in the heat of the battle where individual courage and bravery are displayed, but the warrior did not engage the battle to display his character. Something was worth fighting for, and he did.