Their setting up for something between these two. Usually Big Show gets stuck into matches at WM. But a feud leading to a WM match would be good for Big Show, Booker and Smackdown. Booker T is NOT going to back down from Big Show and this gives him more credibility as the boss on Smackdown.
Would you want to see this match at WM 29? One of the big reasons I'd like to see this match is due to Booker T not having a big WM moment ever in his career. Even if he loses to Big Show it would still be a moment depending how they book the match.