HF has been going for what, 3 years now? They lack the strong story line that Bionicle had, and Bionicle was going for 10 years...I say they've got another 3-4 years in stock for them. How popular are the sets now, anyway? I don't even have any idea how long Ninjago's been going, but I don't think they'll be around much longer. Maybe 2-3 more years. Chima just started, and already the have a MMORPG. That'll last a while. And the sets are good. So is the story. I predict another 5-6 years.