I honestly wouldn't mind if they added to the Story Mode in a re-release, though. It's not a great selling point, because nobody plays a fighting game for the story - but if they have the content more or less ready to go, why not throw it in?
DLC will take care of costumes, characters, and I'm sure even stages down the line as well. If a re-release primarily would be about updates to mechanics - which they could honestly include in a patch, if the point wasn't to make money - they could easily include the story stuff to show these off more thoroughly, as the Story Mode in DOA5 at least was kind of like an extended tutorial.
It's the one thing I was missing from DOA5U/DOA5LR, actually - I wasn't interested in any of the newcomers, because I didn't have any context for them.
I do appreciate that we're getting new intros and victory poses in free updates, though. I'm glad they seem to understand that it wouldn't go over well if they attempted to monetize that kind of thing.