[Pokestick, good times.]

For a typical shounen like Bleach, where things continue on without much change usually anyway, him staying a substitute shinigami even though people feared he wouldn't is final episode-material already o3o

...Of course I'd enjoy a more interesting ending, but would they make such a radical change themselves, potentially ruining any sequels? Don't think so :P

One thought though.

Spoiler:

Yuzu welcomed him when he appeared in the air as a shinigami. So does that mean she can actually see him properly now, and furthermore, are they implying his sisters know everything now? :O