There's no way WWE could have anticipated Booker getting a pop like that. The ONE thing I accidentally saw online before I was able to download the show was Booker's return, and after reading it I was actually WORRIED about the kind of response Booker would get.
Hindsight is 20/20. If they could do it over, I'm sure (as someone suggested) that they'd have Booker hang in there, Cena makes the save, they clear out Nexus, and Booker lasts 8-10 minutes before being eliminated by someone like Sheamus. However, the Cena/Hornswoggle domination segment was clearly more important than Booker. fpalm
Ultimately, he was only "wasted" if he's actually coming back full time. If it was a one-off appearance, there's no reason for WWE to put him over anyone, especially the Nexus underlings who need as much credibility as possible.