I don't think which Superman it is will have an affect on Sales. What will be the deciding factor is quality of the comics themselves. Lets forget that Pre52 is returning and the NU52 may be going(may be), and lets talk about him simply as Superman. DC tried new things with "SUPERMAN," with the NU52. They tried the hip and cool look, didn't work. Stories where Superhero's lose their powers are usually very compelling, because people like the moments when they get them back. They tried that story with Clark again, it had happened to him before, and it still didn't work.
I think it's gotten to the point where people just want to read Superman stories. Old School Superman stories. All Star Superman and American Alien show how just treating Superman as Superman seems to garner the most enjoyment out of the character.
I'm also liking the idea of him getting his own Super family of sorts. That might help him too.
Anyway, you people can bitch all day about which Superman you prefer. I'm just gonna call him Superman.