I like your idea, dude. Bionicle could be improved by Disney if that happened. Or, it would go to Warner Bros. Either, our dear and beloved Bionicle is kind of washed up due to the cancellation of G2. All of this should go to Hero Factory and perhaps other constraction themes as well.
However, I'm not sure if Bionicle being brought out could happen. I mean, When Lego makes an original thing, this thing stays within Lego. I would also go with at least having The Lego Movie Cinematic Universe make The Lego Movies for Bionicle.
Why do people dislike the idea of Disney buying Bionicle? True that when Disney bought Star Wars, it made some things non-canon, but the reason why that happened is because that it wants a sequel trilogy starting from The Force Awakens. The non-canon stuff never happened in these new movies, and if the movies are based on them, new fans would get confused. I find it kind of reasonable because I see that Disney wants the sequel trilogy to look more connected to the original trilogy.
Disney also bought Marvel, but it never changed anything in there on the other hand.
As of now, Bionicle G1 has an unresolved cliffhanger, so if Disney could buy Bionicle, it could somehow make a movie or TV show where a prologue would say where the story had left out and make a good ending to the story. Or, Disney would reboot the franchise into G3, and this reboot would have positive reviews like G1 and be much better than G2. The live-action Spider-Man movies had the same issues as Bionicle, as they both:
1. Their G1's are pretty long and had positive reviews during their runs.
2. The G1's' latest installments got mixed reviews, and this kind of caused them to end.
3. The G2's are reboots who were successful at the start.
4. When the G2's progressed, their second installments got mixed reviews, while the first installments got positive reviews, and then the G2's got cancelled after two years of running. The future plans to continue them were cancelled, too. These are quite traumatic. (See the comparisons here: http://www.bzpower.c...vies-are-alike/ ).
Look at Spider-Man: Homecoming this year. It's a start of the series of Spider-Man G3 movies. It got successful when Marvel got the movie rights to Spider-Man (though they share them with Sony) while being owned by Disney. If Bionicle would get owned by Disney, its G3 would be successful like Spider-Man.
I think Warner Bros. would do the same thing with Bionicle, too.
However, again, I don't think buying out Bionicle or other Lego themes would be something that Lego would do. Letting The Lego Movie Cinematic Universe do the movies for them is something that Lego would do.