I don't think they should bring back Bionicle, considering how they let Hero Factory happen. They would likely try to milk it of money and turn it into a terrible, terrible thing. Example: The other night, I literally yelled out when that new chipmunks movie commercial played on the TV again. I said "You're killing them! Stop it!" It's like they dug up the corpses of the Chipmunks and decided to parade them around for cash by playing into the child's lack of understanding when something fun or controversial is used purely for the sake of monetary gain, thus eliminating any positivity within it.
I do assume you're including the Bionicle Movies in this, right?