Suffice it to say, I was "around" in the 70's - an ex-ABT dancer. I can tell you the following: Ex-cast members came around - Fernand Nault, Sono Osato for example. Enrique Martinez & Scott Douglas were ballet masters though I only remember Tudor & Hugh Laing running rehearsals. Dimitri Romanoff also helped with remembering the Friar(his role). Every one, at that time, had great difficulty remembering the ballet & putting it together - which is why I know that some re-staging was done, at that time, to fill lost elements. There was a notator but the score is not complete. Film footage is not complete. I believe Joan Acocello wrote in this week's New Yorker that it would cost $2,000,000 to reproduce the set & costumes - which is probably at least what it would take.
As to dancers of the 70's remembering it: You have to realize that we didn't do it often. That made it difficult for both dancers & staff. Pillar & Lilac Garden were done ALL the time - but not R & J. Of course if it were to done I imagine some ex-dancers may be called upon. One has to realize that it is the corps work & smaller roles that are the most difficult to see on the films. Re-constructing the principal roles is not the problem.
Re: the question about revival of repertory works: Yes, a ballet is a ballet, etc, etc. But in this financial climate, finding that kind of money for a repertory ballet is a dream. Repertory ballets don't sell as well as full-lengths. Repertory works can't be repeated as often. And the price tag on this one is enormous. If anyone has the $ to donate for this purpose, I'm sure it would come together. Not an easy task, but certainly well worth it.