User blog comment:TheIrregularOne/Why not OVAs?/@comment-265822-20140105171301

I think that if they were a movie or OVA adaptation of a story it would likely be one of the side stories like Toaru Majutsu no Index SS: Kanzaki, Toaru Kagaku no Railgun SS: Liberal Arts City, Toaru Majutsu no Index SS: Stiyl, or even Toaru Majutsu no Index Light Novel Volume SS2 which is nothing but a compilation of side stories.

I'm not sure if making the rest of the story into isolates Arcs would necessarily make them being much more detailed and elaborated. But it is something to consider as apposed to cutting and editing the story arcs like we saw in the first season to make them fit a 24 episode season.