I think Sony is smart enough to realize that because of the time investment, most people who play service types of games are going to stick to a view, whereas people who play single player titles will generally play many in a given years. So, it doesn't make sense to make those types of games.
So, basically, while I prefer single player games, I'm happy that people who like other things can enjoy them. And I'm not particularly concerned about service games replacing single player games. I think companies that tried that route have already learned that lesson, and Sony presumably learned from those mistakes.