According to the column [http://www.escapistmagazine.com/articles/view/columns/moviebob/7014-Spider-Man-No-More] MovieBob wrote about this, Sam Raimi got into a bit of a scuffle with Sony Pictures over creative control issues, namely the villains that would appear in Spider-Man 4. Venom's inclusion in 3 was entirely the fault of the studio and Raimi apparently wasn't about to let his vision be screwed over again.
Honestly, Spider-Man 4 being canceled isn't the absolute worst thing that could happen. They could easily diverge from the whole numerical route and start subtitling the movies directed by people other than Sam Raimi (The Amazing/Spectacular Spider-Man, Web of Spider-Man, Spider-Man Unlimited, etc). Taking the franchise back to its beginnings for a "grim and gritty" reboot, though? Eugh. Count me out.
Like MovieBob said, we'll probably all live to see good Spider-Man movies again. We'll just have to endure some terrible ones in the meantime.
Honestly, Spider-Man 4 being canceled isn't the absolute worst thing that could happen. They could easily diverge from the whole numerical route and start subtitling the movies directed by people other than Sam Raimi (The Amazing/Spectacular Spider-Man, Web of Spider-Man, Spider-Man Unlimited, etc). Taking the franchise back to its beginnings for a "grim and gritty" reboot, though? Eugh. Count me out.
Like MovieBob said, we'll probably all live to see good Spider-Man movies again. We'll just have to endure some terrible ones in the meantime.