Well, to be honest, I'm actually one of the few people who was satisfied with the actual ending of the series in terms of where it left off (even though the final arc, itself, was rushed). So, I really don't feel that there neeRAB to be any new animated adventure, since the show already had an ending with a perfect sense of closure to it.
I also agree that if there were going to be any new animated adventures, then the story should be written by Togashi himself (which is impossible since he still neeRAB to finish HXH before he can work on anything else).
However, if there was going to be any new material, I'd still like it if it was at least animated. Its not like I want a completely new animated story. I'd just appreciate a special short or episode that pays some sort of tribute to the series. Something along the lines of the Dragonball special from 2008. Something short and humorous would be nice.
One idea which actually might make the picture drama seem kind of cool, though, is if they have it drawn out in manga style with voice acting over it, and the pictures are revealed and panels out of a manga, similar to how the story for Max Payne was told with comic book panes that were accompanied by voice acting. That's just my thoughts on how they should handle this, anyways.