You raise the interesting point of 'Great Projects'. I'm sympathetic with the desire for a new space program, but I think it has less to do with a lack of vision and more to do with competing visions. NASA has a harder time raising money in the government because they have to compete against a multitude of other causes and agencies, who rightly point out that money put towards a trip to mars is money thats not going to social welfare programs, infrastructure, or other, more tangible goods. We went to the moon because there was an overwhelming desire to 'beat' the soviets; if a similar desire competitor existed today, I imagine a similar effort. As for winning WWII, its the same basic point that at that time there was an obvious single good to be pursued, winning the war, whereas now there are many different goods. This isn't the fault of our elites or our efficiency, it just points to the fact that we live in a pluralistic society. It would be better to embrace that, and devolve more power to civil society, than to continue to pine for elites who can overcome opposition.