Credit to Misedukatd for the best solution to the Barnett situation I've heard yet. Just have Fedor fight a few of the guys that have expressed their desire to fill the open slot. So you could have a final PPV main card that looks like this.
Fedor Emelianenko vs. Jeff Monson
Gegard Mousasi vs. Renato "Babalu" Sobral
Vitor Belfort vs. Jorge Santiago
Fedor Emelianenko vs Brett Rogers
Paul Buentello vs. Gilbert Yvel
Takanori Gomi vs. Rafaello Oliveira
Fedor Emelianenko vs Dan Severn
If we can't get one great Fedor fight they can compensate by giving us three decent ones, the PPV above certainly looks worth purchasing to me.