As far as I know all they can't do is cripple\brick the console main basic functions from a ban, other than that they can deny any access legally from online services.
Don't Nintendo allow you to at least update the console OS even after a supperban?
If they prevent you from updating the console in anyway offline and online then you have a chance to win as that would cripple the console since even if you buy a game in the future you would not be able to play it as it would require FWxxx update...
Sony and M$ already lost quite a few things from crippling user consoles, but M$ specially went too far ahead by corrupting all data on purpose from banned consoles that's why they lost and fixed it after thankfully someone with balls going on court for the good of all the rest of users on the entire Planet
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But if Nintendo let's you update the console, buy and play any game in the future, then I don't think you can do anything at all against the superban...