There's been lots of back-and-forth on what sort of form Bionicle should take, in the admittedly rather unlikely event that it got another reboot. Some feel that it started as Constraction and so should stay Constraction-based, while others have opined that being formatted as a more traditional System theme would give it a better chance to survive or even thrive. There are good points for and against both, (Constraction is unprofitable and dead, risk of competing against Ninjago, etc.) and talented people like @Sokoda have proven the concept can at the very least work from a building standpoint, but I wanted to discuss the possibility of a third option.
System with Minifigs is definitely a valid direction to go in for a reboot, but more and more I've been looking at the kinds of mechs coming out of Ninjago at the moment and in upcoming lines, and thinking Mixel-based 'constraction' may just be the best of both worlds. It's still built with system, so a vast catalogue of pieces is already available to pull from; CCBS was a promising system but the strong aesthetic homogenization meant that there was a certain degree of limitation to how custom you could really get with it. The smaller scale is more manageable, yet still more customizable and character-oriented than just Minifigs would be. Buildings could also theoretically still be a viable feature in larger sets; nothing enormous admittedly, just due to the scale involved, but still a valid possibility unlike with the classic Technic or CCBS figures; I imagine Mixel-based Toa would probably end up around the same height as the Slizers of yore, so non-character constructs are still viable. And hopefully, this downshift would make the prices more accessible; I could see individual Toa selling for somewhere between ten and fifteen dollars, even in today's economy. Not amazing, but still somewhat more doable than G2's $20 monsters, and with a better price-to-part ratio too. And again, unlike a straightforward minifig-based theme, it has at least somewhat less risk of having to compete against other traditional themes. The mixel joints are already well-established by now, so I think only a few new molds (new heads and masks better suited to the new scale, perhaps?) would be needed at first, since nearly everything else could be done with system. NOT TO MENTION that gear functions could still be included via the small tan half-gears and friction gears, so that would be something carried forward from the old, and would set the line apart from mechs and the like, since the room usually reserved for a minifig pilot would instead go to action features or mid-torso articulation or other neat things.
However, even if all that were to come to pass, that doesn't answer every question. Regardless of how well or poorly the story end of things could work, from a set perspective is it a worthwhile option? Would you as a Bionicle fan accept this change? Do you think the fandom as a whole could adapt, or would it be a bridge too far? And most importantly of all, do you think it could catch on with kids, or would it still just flop like Technic/CCBS Constraction has?