Nick and Niek put together a great looking set given the GWP limitations, I'm actually a fan of how Bionicle looks reimagined in System pieces - Even as just an experiment. The lava base, Takua being included, it's a solid display set. Quite liking those internal MOC and set sketches too, and the creativity behind all those ideas. (That Nuva cube is insane!)
I was primarily into the series from 2001-2005 (And kept up casually with it until 2007), but even I would be open to a Great Spirit Robot set. They're right that a majority of the oldschool fans probably won't be familiar with it, but it's close enough to Mata Nui for me to act as a selling point. Oh by the way, I was glad to see DuckBricks in this conversation, as he's been my favorite Lego Youtuber as of late.
"In 2023, the math says Bionicle fans will now be around 29 to 34 years old, which is kind of uncomfortable." LOL, this part was on the nose too.