I do agree that the current generation lacks the ambition of the Apollo era, but I don’t think cost can be ignored.

Cost of Apollo program: $25 billion
Real GDP in 1969: $97 billion
Percent GDP cost of the Apollo program: 2.6%

Proposed cost of Orion program: $1.0 Trillion
Real GDP in 2009: $14 Trillion
Percent GDP cost of the Orion program: 7.1%

In the future, when the cost comes down and the population really wants it to happen, I am sure we will go beyond the moon.