There is no question at all that Splatoon 2 is one of the most popular shooters that we have seen for the Nintendo Switch.  When Splatoon 2 was first released on July 21st the game had managed to sell over 670,000 units within 72 hours of its release.  Even though, the shooter genre is very popular right now in the gaming world it would be hard to tell whether or not the game would have done as well on consoles such as the PS4 or the Xbox One.  
Since Splatoon 2 is a more family friendly video game it could have easily have been overshadowed by various shooter titles such as Gears of War 4, Halo 5, Overwatch, etc.  As far as the online multiplayer mode is concerned Splatoon 2 would have been perfect for the PS4 or the Xbox One.