I suppose that the content from all the Treasures discs (1DVD9 and 2DVD5s) can be fit onto a single BD-25; however, that would mean there would be a mix of Evil Dead 1 and 2 materials. Also, all the materials are in SD, so it's probably better just to have it as a DVD, so DVD players can upconvert it well. Someone may also need to make new menus.

SeeNoEvil is working on another Evil Dead disc, an improved version of his Treasures Collection, but is still far from completion; if comprehensive enough, that could probably be put on a Blu-Ray disc.