8. More Spider-Men
Peter Parker is far from the only Spider-Man out there. In the Marvel Universe proper, there are clones like Ben Reilly and Kaine, not to mention characters such as Spider-Woman and a number of Spider-Girls. In other universes though? The possibilities are endless.
Spider-Man 2099, The Ultimate Spider-Man, Spider-Man Noir, Spider-Gwen, even Spider-Ham! So, why have we seen none of them on the big screen? If Sony were smart, they would launch a number of spinoffs featuring these characters, building up to an Avengers-level team-up movie like The Clone Saga or even Spider-Verse, a comic book event taking place at Marvel as we type this.
They may all share the Spider-Man name, but each of them are very different characters who live on very different worlds. They could have hit after hit on their hands with these movies.