Board Thread:Series Discussion/@comment-27287555-20170501143734/@comment-918376-20171113174212

You forget that anime projects take a while to plan and sort out. It's ridiculous to think they'll instantly get working on a third season once Mamare finishes the web novel. It's taken A Certain Magical Index 7 years to get a season 3 since the end of season 2, but the light novels have been publishing the whole way through those 7 years. "Having enough base material" is no guarantee for more anime seasons. If it were, Maoyu would have a second season.

Furthermore, the web novel has been on hiatus since August without volume 14 completed; we have no idea when he'll be finished. Kanami's side-stories were integrated into the main story after Mamare claimed it would be a 15-volume series, so how that'll affect the volume count has yet to be seen as well.