If only you could A) land a space shuttle on the moon,

See Nasa's most recent announcements.

B) extract the helium in that quantity

AFAIK this is easy.

C) PRODUCE NUCLEAR FUSION

See ITER.

D) sell the public on said NUCLEAR FUSION

That appears to be the sticky part, but fortunately its going to be about 15 years before we really need to worry about that.

RE: US: UW scientists want to mine moon energy | EnergyBulletin.net | Energy and Peak Oil News