Iam sure that Goldberg would love to work for TNA especially if he can get the same sort of deal that Sting has.But i think it would be bad for the company as he is not the same big name that he used to be and everyone knows now that his time in WCW was overhyped and he only has about 5 wrestling moves.
As a one off appearance at a ppv i think it would work well but not for any length of time.