If an anime was made and restricted to 26 episodes, and was given license to redo and rearrange some stuff, I think something workable could be made (EDIT: of the current Blood War arc in the manga). I'm thinking:
* Get rid of the Hueco Mundo stuff. Find a shorter way to introduce the villain Quincies, such that Ichigo is already fighting that one guy by the end of the first episode.
* Remove the bankai stealing stuff, or at least make it only the ability of that one guy that steals the first squad vice-captain's bankai.
* Cut out the training stuff for side characters, and the hinting for Tsukishima etc. coming back.
* Still devote an episode or two to the flashback with Ichigo's parents, since there was good stuff there.
* Greatly shorten the zombie stuff. We don't need those random Arrancar coming back, for instance.
* Cut out a bunch of fights.
* Remove the flashback with the fire guy and the balance guy, and generally the stuff with Quincies turning good, that hasn't gone anywhere anyway.
* Ichigo hasn't actually done anything. You can show off Quincies who would otherwise get their fights cut out by making a montage set to "Number One" of Ichigo using his new abilities to take out a bunch of them.
* Switch that Roman warrior guy and Gremmy. Gremmy is now one of Ywach's special warriors instead of him. It made no sense that the reality warper apparently wasn't good enough for that. So, people fight the Roman warrior, Kenpachi shows up and easily beats him. He doesn't get taken out by those girls now. He goes on to fight Gremmy, who actually does try to use his reality warping on his body but Kenpachi's spirit energy is too strong or whatever, and the fight goes on as normal, except Kenpachi is forced to use his bankai.
* There still needs to be an entire episode devoted to that Mexican wrestler guy beating people off screen, because that was hilarious.
* Add a fight between Ishida and Mayuri, where Mayuri is killed, because why the hell hasn't that happened, Kubo?
I only remember half of this stuff because of those videos linked earlier, so there's probably even more stuff that can be cut out.