well it depends on what you think
Bionicle: The mask of light.
totally
we dont know yet
Of course they're not the last Bionicle sets. Well I've got 100% proof of that. If bionicle will end on 2009 bionicle will loose most of the customers and it will be the worst lego theme. Bionicle was created by Greg Farshety as well as the lego theme with "least" pieces. Its the 5th most popular lego type. The fourth is "Indiana Jones" third ninjago second and the best pirates of the carribean and star wars. This answer answers your question. See more of our bionicle questions.
Ackar
Due to kids not buying it anymore. Not enough money.
The biggest Bionicle set is the Kardas Dragon, which you can make by combining Axonn, Brutata and Vezon & Fenrakk. New, slightly bigger bionicle is the large 2009 Mata Nui set, clocking in just taller then Kardas.
ToysRus is your best bet.
In my opinion, Lhikan, but there is no single answer to this question. :)
Takanuva is the 7th Toa Nuva, he is the legendary Toa of Light and has defeated Makuta, the Makuta Metru and the Rahkshi. Takanuva was sold in two forms, once as a Toa Nuva with his Rahkshi Cycle and a second time as the second tallest Bionicle sold. Takanuva was originally Takua and featured in the 1st BIONICLE movie. The reason why many fans adore him is still unknown.
eBay and Amazon are your best bet.
There will be no 'Bionicle 5' because they are ending bionicle sets.