Why haven't they remade this yet to follow the whole manga?
Because it was only popular in the west.
and the only reason the anime didn't do will in Jap'n is because the anime didn't follow the manga.
so that didn't answer his question
>animating completed works
Because it needs the sales to justify it really
There is one airing right now
New HxH (albeit that one is doomed for oblivion, not the studios fault though)