If the Security Council members unite and vote for a second resolution that includes exile, then he no longer has France and Russia on his side trying to prevent his removal. More importantly, he will know that a failure by him to except the deal will bring about the termination of his gig.
The only thing that will prevent him from taking this deal is if he would still fear for his life in exile.
Pull out a hat you would like me to eat if he goes into voluntary exile.