At the risk of getting into a pissing match...
@NoneSuch: Let's check your evidence.
- CE3K took $303m box office (you forgot to add that in)
- Raiders of the lost ark was released in 1981 (and "we are talking about only the 70's" )
So I make the running total for the 5 other influential directors $1142.1m + $303m = $1445.1m. Almost double what Lucas did alone,
Granted, Lucas had the highest grossing film of those mentioned, and granted, ILM changed the game in movie special effects, however the figures you used to back up your argument were presented wrongly.
Don't get me wrong, I like Star Wars. I just don't agree that George Lucas single handedly resurrected the US movie industry in 1977. He has helped elevate sci-fi from B movie material, and that, to a lot of people around here, really seems to matter.