Pros
-Less or no software droughts from Nintendo
-certain games less likely to underperform due to being on a single device with a low install base like certain Wii U games
-can get the full Nintendo experience on a single device
-more freedom to choose device which suits ur personal preferences
-increased chances of new ip and dormant franchises being released
Cons
-Nintendo might lose out on hardware sales now that people may not buy both form factors
When the herd loses its way, the shepard must kill the bull that leads them astray.