I saw this, and their numbers are completely off.

Star Wars was not a low budget film. It was not even a modestly budgeted one. It was a big-budget blockbuster and one of the most expensive films made in its day. A typical film, like Annie Hall or Taxi Driver, cost about $4 million. Special effects films like Logans Run and Planet of the Apes sequels cost closer to $6 or $7 million (which is what SW was initially budgeted at). At $11 million, Star Wars was one of most expensive films of its time--not on the level of Jaws, but up there. All the crew talks about how there was no money--this is because the scope of the film was so disproportionate to the budget that everything had to be stretched to its limits. Lucas made a $20 million film for $11 million. Part of the reason the budget didn't go that far is because Lucas developed all the VFX in-house, which cost a lot upfront but saved a lot overall--Peter Jackson did this with LOTR too.

If Star Wars was made today it would similar to the budget of the prequels--$250 million blockbusters made for half of that cost. But still bloody expensive.