Yeah between injuries and age, and the fact that neither guy is a legit MMA fighter (Tank might be recognized as one, but he's always been a glorified brawler who came up on the better end of a "puncher's chance" a few times allowing him to create a fan base and be considered part of the SPORT) my interest level for this one isn't much. It won't happen in my opinion, as Goldberg ignores offers to put on spandex tights and do a spear and jackhammer for a billion dollars on a regular basis, so fighting someone who could legitimately detatch his head from his big ass shoulders for a much smaller amount of money would seem like something that's never going to happen. Then again Goldberg always fantasized about being an MMA fighter, and in his mind beating someone like Tank who just comes in swinging would legitimize Goldberg in the MMA world (again, in his mind) and would allow him to walk around like the mega-bad ass he thinks he is.
Plus shit, they wouldn't hurt a smaller company (this fight even if it does come off won't be in the UFC at all) with a big ass headline bout like that. Would put a new company on the map, and there's never too many up-and-coming organizations in MMA, as we've learned recently.