Eventually most will oblige however I feel there will probably be a select few who choose not to even with money and the title on the line. Hey, I'm a fan like everybody else so I'd want to see Kos vs Fitch (purely for entertainment value as I don't like em,) Anderson Silva vs Lyoto Machida, Nate vs GSP, Wand vs Shogun (could have happened in Pride), Daley vs Hardy, Rampage vs Tito, Bisping vs Rampage (lolz), Renzo vs Serra (another...lolz!), Diego vs GSP (somewhere down the line if it ever happens), man there's tons out there. Last I really wanted to see Ken vs Frank Shamrock. The first brother vs brother fight (well almost brothers.) Money vs honour.
I think out of all the ones listed Anderson vs Machida or Renzo vs Serra or Almeida is least likely to happen.
PS: Who would want to train outside of paradise in Hilo, Hawaii...lolz! I wouldn't...I'd form the team around myself...haha.