Yeah, Pokemon GO! may not be as hot as it just released, but there are still hugh amount of people playing them. I know a group of Japanese (who are my colleagues in Japan). They like playing Pokemon GO!, some of them are Pokemon fans, but some of them play Pokemon GO just for walking and doing execise during the gameplay!
I think having games from different walks of life is the key of success to games like Pokemon GO! If it can only attract PokeMon fans, it will not be as successful as it is right now.