I have nothing of value to add here other than wondering why FilmMakerJ hasn't responded here. I'm interested to here what he has to say.
Well thank you Gozar.
The only reason I didn't say anything in here yet was because after all the research I have done thus far, I have heard nothing to the effect that the movie blacklisted Miyazaki in anyway. One usually doesn't get blacklisted after a film simply annoys a fanbase. Take a look at J.J. Abrams for instance. A lot of the die-hard Star Trek fans were pissed at that, but he's right on making a sequel because it was a good movie, and a lot of us out there still liked it. (Me: I loved it.)
Cagliostro, as we know it today, is a beautiful piece of work, worthy of being placed next to other great films as "The Pink Panther," "Sound of Music," "Chitty Chitty Bang Bang," any of the Sean Connery "James Bond" pictures, and comedies like "the Court Jester." It in no way should have ruined anyone's prospective career even if some long time fans of Lupin were disgruntled. Disney picked himself right back up after Fantasia flopped because he had other avenues to look into that helped him push through the hard times, and he eventually made "Cinderella." It was a close call sure, but he wasn't out of work or blacklisted (Disney tends to do the blacklisting anyway.

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And I agree with 'fantasticmrfox' that Miyazaki had some hard working days ahead of him, and some uncertainties. Most directors take a while to get to their first feature film, and that same amount likely take a little time again to get the second picture going. If you watch the short documentary on the Nausicaa DVD and/or Blu-ray, it states that Miyazaki had a hard time pitching the Nausicaa story to studios because he didn't have a tie-in Manga; which most producers and backers in Japan like to have. So Miyazaki started to write the lengthy manga, beginning with the main chunk that would be turned into the feature. And if he had to help design and direct characters and episodes of Sherlock Hound and Anne of Green Gables at the time, along with those 2 Red Jacket Lupin episodes, of which he had to do all his own storyboards on top of the manga artwork: then yes, that absolutely could take a few years to do. And...of course every guy needs a little down time, don't you think? He's constantly going into retirement to take a break, only to come back and make another movie.
So no, I don't think he got blacklisted, I don't think Cagliostro ruined his career for a time. If he had not made a film in 7-10 years I might have theorized something to that effect. But he was still hard at work. And he needed to also build a team of animators and bring in other people to help make Nausicaa, including bringing on Toshio Suzuki as a Producer after they had had earlier encounters over less than steller interviews.
I know it's not at all a fair comparison, but I myself haven't made a new film until just two months ago for my "Intro to Film" class here at SCAD. The last time I made a movie before that was all the way back in 2007 when I tried to make something called "Olympucaper." I won't explain what that is, it's a piece of crap anyway. But that was 5 years ago. And I
wasn't "out of work," heavens no. I was too busy making Voice Impression videos between 2009 and 2010, making artwork for people, doing homework, remodeling my family's house all summer long in 2008, going to Disney World multiple times in 2009 (which is where I picked up the "Cagliostro" storyboards), etc. I also wasn't very good at writing scripts or dialogue, I've only recently started to get better at that because I have a stronger and more mature understanding of the craft.
So I wasn't out of things to do, and neither was Miyazaki. I love the Castle of Cagliostro, and with all the dozens of ways that Lupin has been portrayed over the years, I wish anyone who still doesn't like Lupin's portrayal could just imagine it's Lupin's less horny brother. Enjoy it for what it is, not for what it isn't. I think we've exhausted all our possible arguments by now anyway.
Enjoying every facet of this franchise is why I love it so much, and that's why I joined this forum.