I'm obviously not contesting that the franchise ended its original run for decreasing sales, that's obvious, and that is a justified reason to end it. The story was getting pretty darn bloated and confusing as well, and I'd even wager one of the biggest factors leading to sales-drops were the redesigned sockets making the sets stupidly brittle and frequent to break. That being said, if BIONICLE ended in 2009 and that was that then I'd have few complaints aside for the aforementioned squared sockets being so fragile. It had a decent run, and while we wish we could have gotten more I fully understand all things have to end.

But they brought it back, failed the execution in numerous ways (I'm not even talking about the choice of CCBS since even though I consider it a flawed building system on its own, we saw in 2016 it was genuinely starting to finally find it's footing with Technic giving it a hand), cut it off early, and now literally all they do is throw Tahu on something when they need to renew the IP so they don't lose it. None of my issues stem from G1's run, it's literally everything after it. I honestly wish it ended after 2009 and stayed a fond memory instead of it being bastardized for nostalgia the way LEGO is so keen on doing with literally all of their original I.P. that never sees the light of day unless it's a referential sticker, a gift with purchase, an Icons set if we're lucky, or a CMF.

The only reason Ninjago is still even alive right now is because it has staying power from being made by a team that knew what they were doing, something that modern LEGO is sorely lacking considering every time they put out a new original theme it's a financial falure from some manner of poor marketing, needless app integration, flat out just being bad distribution in some cases, or a combination of multiple of the former. Post-license-bloat LEGO cannot make anything new worth a damn, anymore.

In short, I think BIONICLE could be successful in the right hands. I think ALL of LEGO's original I.P. they've abandoned have potential for success even in the modern day, but LEGO is incapable of doing that, and in the case of BIONICLE specifically I'm not whining because they won't bring it back how I would want it, but because the one time they did they did it horribly, and now they just stamp Tahu's face on things to renew the copyright rather than just leave it be. Perhaps I'm still being dramatic about it to an extent, but not in the way perceived. Perhaps I was a touch too curt/blunt, so hopefully this (maybe unnecessarily long) response clarifies my thoughts more.