This may be an unpopular opinion, but I would've kept everything on the island of Mata Nui. Or at least keep the tribal environment. I know this is a horrible idea marketing-wise, but I just loved the idea of sci-fi robots in a tropical island/tribal setting. It seems oxymoronic, which was what made it so delightful. When we went to Metru Nui, yeah that was cool, but it was robots in a robot city environment. Wow. Haven't seen that before. Like I said, this is probably a horrible idea because things need to be mixed up and made new to sell moar toys haha. But yeah that's what I would have changed/kept the same.