Interesting article here.

Caceres noted that the space industry tends to view the future in terms of 5-10 years out, not 20-30 years. He stressed the importance of working within 10-year timelines in order to maintain political support and hold the public's attention.

"The 'within-10-year first-launch timeline' is a pretty good place for NASA to start as it seeks to fill in the details of the Space Exploration Initiative. But the agency cannot do this unless the Moon-Mars efforts are clearly defined and marketed on their own specific merits ... starting with the Moon, since that's the mission that is most doable in a reasonable timeframe."

Caceres cautioned the Commission, "De-link the two missions, otherwise there is a better than even chance that you end up dooming both