It is not so much that I do not want a G3, or that I hate BIONICLE and never think it could come back....wait...yes I do..
Under-preforming, lazy, forced, pandering, disappointing, restricted, generic, a waste of time and money, ETC.
G3 would be tied to the BIONICLE name, which already restricts it a great deal because of G2 and how that worked out. Sure we can give it a chance, but that does not mean it would be good, or even work.
Sure, I can't say that BIONICLE will never return, but I can say that it is highly unlikely.
I find that BIONICLE honestly should be left alone, LEGO has shown that they don't care enough to put work and effort into it and so has the public.
BIONICLE has had its time to shine, and it blew it the second round, I highly doubt that third times the charm.
Now, because change is scary and all of that, I would love a good revival of BIONICLE, I just don't see it happening. Heck, I would give my arm for a HF G2, but life is unfair and the world does not work that way.