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Could there possibly be other schools out in Japan involving martial artist. I was reading book 7 and it caught my attention that there could be more martial arts schools and possibly Toudou is at the head of them or maybe there is another head school. Oh Great could continue the storyline through the use of this idea. Maya, Mitsuomi always talking about the entire martial arts world. So there could be and should be other martial arts schools. There shouldn't just be one martial arts school for all of japan. I think it would be interesting to see other fighters from other schools appear after this arc.

Maybe, but Toudou is a place that gathers all the talented people.
We don't really have to worry about other school, and Takayanagi family has been gathering people with potential special powers around Japan in Toudou to manage them / do experiment on them.