I believe Bionicle specific names and terms can be handled in a way so that it does not oversaturate the line yet still be present. Besides that, it was more likely that it was the amount of plots going on at the same time that caused the majority of the confusion and consequently, cancellation (not to mention the greater rate of breaking pieces).
There are a couple of ways to go about handling Bionicle specific terms and names, some of which can be used in conjunction with each other.
This first point is actually inspired by what one of the guys at comic-con said "The Heroic Toa". The idea is to just add a bit to the end of a name, instead of "Muaka", advertise as "Muaka Beast" or "Muaka Tiger".
Some things will only need to be known in one year, kids who arrive in later years will not have to learn what the names and terms refer to, to understand the current year's plot and stories.
The webisodes/animations are visual, this allows children and newcomers to easily understand what each name or term refers to. I remember that the only vague idea of the Bionicle universe I understood when I was a kid were the mini videos and movies.