The other consoles aren't "dominated by multi player games." There are tons of single player games available and more on the way, especially from Sony. The next Elder Scrolls is going to do crazy numbers on both Xbox and Playstation.
That has nothing to do with anything.
Most likely, it's as simple as Nintendo actually talking to Bethesda. That was what Peter Hines ranted about regarding Nintendo during the Wii U era. Actually, that rant itself might be the reason for the support Bethesda is giving now, which goes to show that airing complaints can be a good thing. It might have been a wake-up call for Nintendo executives who were in-charge of developer relationships. Either way, communication is a good thing.