Well, No one is buying a Switch because of Mario Galaxy or Zelda WindWaker. So if they're not selling hardware what's the point in keeping them exclusive when you can make money from them elsewhere?
Besides, that is a really shortsided point of view. Yes, most people don´t buy a console for just one game, but once any particular console has 5 or 6 games that you want to play and cannot find anywhere else, that´s when your more likely to make the jump. Why are we arguing this? It has worked pretty good so far for Nintendo and Sony.