Goldberg, Lesner, Savage, Bret Hart, Honky Tonk Man, Backlund, Bruno or David Sammartino, Ivan Putski, Ken Patera, Don Muraco, Pedro Morales, George Steele, Ultimate Warrior, Kidman
Are you referring to Billy Kidman? Because as far as I know he's a trainer down in FCW. While unlikely, chances are that he could appear in a WWE ring in the future. As for the others you mentioned, bar Ultimate Warrior, Lesnar, Goldberg and Savage, there isn't a need or want for their return, that would be beneficial for the WWE, so you can count them out on that basis.
I think the only certain names are Bruno Sammartino and Jeff Jarrett. Not only did Jarrett right royally screw Vince on his exit from the E but he's Mr TNA.
The thing is Vince will always bring in those that can make him some money regardless of his feelings, while I agree that the need isn't there, Billy Graham would return for the right paycheck as would others, and that is what McMahon gets off on. This is why we will see RVD, Jeff Hardy and Kennedy back in the WWE.
As for Brock, the guys has burned every bridge he has gone over, chances are him and Dana will fall out over something and will eventually be make his way back to a WWE ring, the fanbase is there and would make a tonne of money for Vince.
Bret Hart will be seen in a WWE ring at some point, like I said it's a money thing, being a legend doesn't pay the bills the same way TV does and as he gets older and the fans get younger, he'll continue to fall into obscurity. So, eventually, he'll swallow he's pride and take the offer.