Also--Fox spent $20 million restoring and updating the films from 1993-1997. The films were very meticulously restored, by hand and also digitally. The only bit to do would be to wash the negative again (it's been handled since then) and do a 4K scan, and then retrieve the missing pieces from storage (or other print sources if they are damaged), clean them and splice them in. This accounts for, what, maybe eight minutes of material for ANH and five minutes for each of the following two films. How long do you think that would take? Just over a week maybe, plus all the release/home video prepwork. Cost maybe, I dunno, 300 grand or so per film?

Can't be that much more, the scanners are in-house at ILM and so is everything else, since 110/120 minutes of each film is already restored your main cost is the labour of the people actually putting those bits together. You'd have to pay a film librarian a day's wage to identify and retrieve the missing pieces (day 1), pay a supervisor to approve or select another source (day two), find and approve any alternate sources (day three), pay a lab technician to clean, scan, digitize and back up the negs and new pieces (day four), pay an editor and assistant editor to log it all and then edit together a new D.I. (day five), pay a colour correctionist to grade the D.I. under the supervisors approval along with select areas of digital repair while a sound mixer scans and masters the soundtracks (day six, seven, eight and nine maybe?) and bam, done. You overlap the film work so that you are constantly moving the work forward (i.e while ANH pieces are being scanned the film librarians are searching for ESB, so they can be scanned while ANH is in the D.I.) and within two weeks, you have a 4K restoration of the entire trilogy, probably not costing more than a few hundred thousand dollars. They could add a $2 tax to the tickets for the next Celebration and the fans themselves would have footed the bill.