Not at all. Why would they do that? Sony hasn't, Microsoft hasn't, Nintendo won't. Even bands wouldn't change their name this far into their career - even if it was something absolutely terrible they would otherwise wish themselves to be rid of.
Everyone knows who Nintendo is. Changing their name this late into the game would cause unnecessary confusion and lose potential customers as a result. So, no, I don't believe Nintendo would do this, they have no reason to and every reason not to.
They'll be remembered forever as Nintendo, from now until they fade into obscurity, and this will never change. Especially not in our lifetimes.