Spider-Man 4

Spider-Man 4 was a proposed sequel to Spider-Man 3 with a 2011 release.

Why It Was Cancelled

 * 1) Spider-Man 3 got overwhelmingly negative reviews.
 * 2) Fans were disappointed with Spider-Man 3.
 * 3) Sam Raimi, the director of the first three admitted that he was exhausted and unhappy with the third film and decided to cancel making the fourth film.

Result
Marvel hit the reset button with reboot films The Amazing Spider-Man in 2012 and The Amazing Spider-Man 2 in 2014. Then in 2017, Sony picked up Spider-Man Homecoming.