I honestly don't really care whether or not HF ends or not, it's the sort of theme that they can keep adding year-long not really connected storyline, but I think LEGO might have to start thinking up more innovative "themes" (Jungle, Breakout, Mechs) for future waves of the series. What I really want to see is a LEGO theme with the building system of HF and the lore of Bionicle. Which, if Bionicle comes back, is probably what it'll be like.