I have Robin Wood's little book on Hitchcock, the first edition, printed in 1965; I also have his 69 edition, his 77 edition, and his 96 edition; I think Wood's ever-evolving book on Hitchcock is the definitive work on that director, and have told Prof. Wood so personally, on at least two occasions, as he lives here in Toronto. However, I am in complete disagreement with him on the value of Marnie, which I find loaded with dime-store psychology, badly acted (esp. by the non-actress Hedren), badly directed, creepy, and can only thank God that grace Kelly didn't do it. Afterwards, Hitch was never the same: Torn Curtain, firing Herrmann, losing his favourite editor and sound man, Topaz, Frenzy- they're all really weak films. I only like his last, Family Plot, becuase I think its a good script competently directed, but probably he should have retired after the Vertigo, North by Northwest, The Birds and Psycho run: these works tower over everything that came after. Hitch made too many films.
As for Kubrick, have you watched Eyes lately? Its very superficial, and a sad end to a career which gave us Paths of Glory, Lolita, Dr. Strangelove, 2001 and Clockwork Orange. Would that he would have stopped there!
As regarding health: Welles was not only to direct but to star in all of the pictures except Cradle; I really don't think he was up to it. Heck, he's even got the tremors in the college interview material from 1978 intended for "Filming the Trial". And many were very worried when he was in a wheel chair and very infirm in Paris in 82: from all reports, he was really sick. My guess is much of the funding which fell through after Wind finally collapsed for two reasons: his reputation and his health. He already had a long-standing reputation for not finishing projects, and if he was very fragile and ill as well, this would be another reason for cancelling funding. You know, a man at his age, in his health and carrying his weight, could go at any time, and an investor wouldn't want to get stuck with half a Welles film. Just compare Welles at the 75 AFI, and in the 82 Leslie /McHaffie BBC interview: its a different man. As for the Griffin show the night of his death, I saw that and thought he looked like death warmed over; he had lost too much weight and looked drawn; some think the rapid weight loss was what killed him.
Maybe God made sure Welles didn't make too many movies, although a friend of mine wishes he had stopped right after Chimes. Personally, I would have liked him to complete DQ in 1970 with a Lafagnino score, and then quit.