Though his run in the WWE may have been very lackluster and by the end of his run most of were sad to see him leave with such a terrible last match. See Goldberg fought Brock Lesnar at WrestleMania 20 which was both men's last match in the WWE. Thus far that was Bill's last match in a pro-wrestling and though I know Goldberg was never really the best name in the ring, but I know he was a lot better then the match with Brock made us think, and I don't think he wants to go out like that.
I know at his age it might be very hard to actually make any sort of a return for something more than just one match, but if it's possible I think that would be a shot in the arm for the company and finally let the company do something good for a star they didn't create. Especially with his involvement in this years WWE game I don't think there has ever been a better time to pull the trigger on a Goldberg return to the company then right now.