Legacy is so fresh, and really gaining steam by their own accord. We've seen the McMahons turn on each other countless times...do we really need to see it again? I don't think it would add much to this story line. The whole point of Legacy seems to be that they're getting shit done with violent tactics, by themselves...they're fuckin vigilantes..lol. Adding Steph to the mix would really water it down. I think what Legacy needs it to beat the McMahons, not align themselves with any of them.
However, if any of them do join with Legacy it'll definately be Stephanie. I mean... whatever happened to that whole slap in the face "RAW IS MINE!" angle. That kinda dissolved out of nowhere didn't it?
As far as the actual match goes I'm sure it'll be pretty good. It's a fuckin street fight so regardless of how rusty Shane's in ring skills can be as long as he can swing a weapon he's pretty much good. I'm kinda hoping for one of his flying elbow through the announce table spots.