What I really look forward to is people on IMDB creating alternative movie endings or alternative scripts instead of bashing the movies :)

Or in addition to, because the movie bashing is quite funny in itself.

I'd love that too, but I don't see that happening.

Fan fiction is not easy legally [0]. I expect if it happens it will be found on much more underground places than IMDb.

[0] https://en.wikipedia.org/wiki/Legal_issues_with_fan_fiction