I would worry that if you convince him to "burn his ship", and the company goes down in flames, he will hold a lot of resentment against you.
I really think that he needs to be in a place where burning his ships is his decision.
No matter how awesome your company is, things are going to get bad. There will be long nights, rejections, technical problems, and failure will loom large. You can make it through this with a good attitude if you really believe in what you are doing. If he is just tagging along with you, I'd worry that he wouldn't have the kind of emotional investment that would see him through the bad times.
But more importantly, I think you would want to bring people into your company that add to the momentum. You want people who inspire you and push you harder. Creative ideas, fresh perspectives, and emotional encouragement aren't going to come from a reluctant, non-committal person who is only there because he burned his ship.
My two cents. =)