I don't. I mean if you guys are concerned about 1p player content, then that shouldn't be want you want either.
More characters means more development time dedicated solely for that and less for mini-games, cutscenes and other one player modes.
MK9 had around 20ish characters. The sequel, despite having new faces, is still around 20ish characters. There's a reason for that.
Meanwhile, SF4, a much better and more successful tournament game than MK9, has 44 characters.
They need more 1P content than they have had, though, so maybe a smaller cast helps that.