hate to disappoint, but the director of Back to the Future has said many times that he feels the Trilogy is PERFECT the way it is, and just doesn't see a way to do a 4th. ....and doesn't want to DO a 4th.....which he feels would just be a cheap money making scheme......
kind of like marring a masterpiece.
As for Rambo and Terminator........everyone knows they are both trying to top each other for the most sequels any one movie can make. Sly is clearly the winner with the Rambo and Rocky movies.......but Arrnie won't give it up, so is cranking out yet another Terminator.
maybe when they are both 90........Rocky can fight a Terminator from the future, in Rocky 17 or something.
As a matter of fact.....if you look closely at the ARNIE Movie......Total Recall, when they are walking thru the space port on Mars.......there is a poster on the wall, that shows an 80 year old Rocky, and the Title of the film is Rocky 23 or something.
it was a direct shot at Stallone.
Then in Demolition Man, Stallone took a swipe at Arnie's political ambitions, and had him being a past PRESIDENT-
In any case..........Of those 3, I will probably go see......Terminator , Dark Fate.
For my own 80's sequel wish list.....I would love to see a sequel to "St. Elmo's Fire" and see how they all turned out.
I wonder what Ally Sheedy is up to these days?