I doubt moving their IP into TV shows would help at all. Mostly because churning out a bunch of TV shows based on Nintendo IP would end up being a mixed bag qualitatively.
If Nintendo wants to get back to gaming dominance then they need to make games and gaming systems that are compelling to gamers outside of their core fanbase. They don't need to go down a side track of trying to turn game IP into TV IP.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
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