There will always be evil for the Toa to defeat. Marendar, Makuta, Velika, and so on. The last few serials showed us that, and while I'd like to see a continuation of the previous story that tied up all the loose ends, I suspect that Lego will opt for a hard reboot instead, with nothing buta set of heroes, villans, and a mcguffin to find. The latter type of story would be easier for newer, younger fans to grasp, in addition to acting as a nostalgia bomb for the older fans