I have a player who will regularly agree that Pershing x is the group's best option, spend a session or two doing that & then dig his heels in refusing to do x without plot fellatio and bribery by npc to appeal to him if I'm not prepared to immediately come up with a new adventure. Somewhere along the lk e I gave up and noticed last time I just declared his character does x with everyone else and when he said his cjstscyer didn't like it I just said it was as delicious to him as everyone else before immediately moving on.