derGoldstein writes "Yesterday we discussed which sci-fi should get the reboot treatment next. If you consider Spider-Man as 'proper sci-fi,' then it would appear that's the answer. 'Sony Pictures decided today to reboot the Spider-Man franchise after Sam Raimi pulled out of Spider-Man 4 because he felt he couldn't make its summer release date and keep the film's creative integrity. This means that Raimi and the cast including star Tobey Maguire are out. There will be no Spider-Man 4. Instead, the studio will focus on a reboot script by Jamie Vanderbilt with a new director and a new cast.'"
Perhaps Raimi is too busy working on other projects.