Not even Buckaroo Banzai vs. The World Crime League? The live-action adaptation of The Last Unicorn? Star Wars Episodes VII-IX? Or a real John Carter of Mars treatment?
I take your point, but if Michael Douglas and Jeff Bridges can return to iconic roles 20+ years later, I think any of those films are within the realm of possibility.
Bumped to note that, just six years later, two of those four things have happened or are happening.
I see no evidence of Buckaroo Banzai vs. The World Crime League happening… 