Unlikely, but for what it's worth they were never committed to NOT bringing it back. Part of the reason they ended it when it did until milking it until it was dry was so they could leave that door open. If they had kept BIONICLE going until it became their worst-selling theme they'd have had a much harder time trying to convince retailers and licensing partners to put their faith in new BIONICLE sets, let alone any similar products. As it is, being able to boast that they're "the creators of BIONICLE" still holds some power, if not as much as it would have back in 2002 or 2003. Related: this is why Galidor is probably never coming back. It's got a story that could probably have potential if its creators were to approach the sets from a different angle, but no retailer or licensing partner wants to invest in a franchise that nobody in the industry remembers as anything other than a miserable failure. Yes, yes, I was mostly joking. But you're right, when Bionicle left, Lego never said, "It's gone forever." They said "For the foreseeable future." Which means we can know for certain that Lego had no plans for a permanent end of Bionicle.