What amount of goodwill Nintendo burns away is more than made up for by them continuing to make good games. I am confident that there is quite literally nothing they can do as a company to hurt their reputation enough to be fiscally damaging, save from actually making bad games. And even that doesn't seem to be an impediment to them (see also: the Pokemon mainline games).

They'd have to have a string of probably 10 consecutive years putting out absolute dogshit before they'd get even close to feeling the pain.