Ahi-Dagra

...es, and that's one of their most popular lines. Chima is just another peculiar original-series investment by LEGO, especially weird as it's effectively replacing the remarkably popular Ninjago for one year.

Children have a longer attention span than a year.

However, I must note that Bionicle, within its first year, had Mata-Nui online game, a comic book series, and a couple dozen toy sets. It was also coming off a few more Technic lines of toys, just as Chima would be coming off of Ninjago, Hero Factory, and Exoforce. (Not that I'm super happy about LEGO pumping out more and more toy themes.)

Children most certainly have a longer attention span than a year. I know from being one.

It's true that BIONICLE had all that, but some people have a problem with Chima because it seems to have been designed expressly to push out Ninjago, which had all the same things (on- and offline games, TV series, lots of sets), and is and was quite popular. Compounding that is the fact that Ninjago was already set to have 2013 as an off year and return in 2014.