I'd rather not see Haurchefant return. Just because he's a 'fan favourite' I think it'd do the story a major disservice. We shook up the entire core of Ishgardian society and such a thing should not happen without meaningful consequences. Haurchefant's demise is one of those meaningful consequences. FF7 wouldn't be the same if Aeris could be brought back from the dead, nor would Game of Thrones be as gritty if certain characters were brought back to life unscathed.

He had plenty of screen time and will no doubt be references in passing in the future. It's time to focus on building up other characters now - and after what happened with Nanamo I'd really, really dislike seeing another 'death' reversed.