Co-promotion would have been a last roll of the dice for WCW, something they may have considered when the wheels were coming off in 2000. Maybe, just maybe, a deal could have been done with ECW or WWF to co-promote a mega show. It would have been an injection of exposure, something to get WCW back on track. But that's also why WWF would have been reluctant to do such a deal. Then again, Vince would have known that such a show would break records, everyone would have made money. Plus, in 2000 there'd have been no way of knowing that WCW really would die a year later. WCW could have sold it to the WWF as a once in a lifetime opportunity to do the biggest pay per view of all time. Headlining matches could have been Goldberg versus Austin, Hogan versus Rock, and of course, McMahon versus Bischoff!
