Yeah I was wondering this also, the rumour was going round to the point that I thought it was actually going to happen, and would have done more comercially for Bon Jovi than Because We Can did by piggybacking on the Girl On Fire promo. Whether it would have been any better or worse than what's on the album I don't know, and plenty of fans would shudder at the thought of the duet, but it would definitely have been more relevant to a hit.