If you can talk about this subject with him, there is hope.
Most of the time these guys are so emotionally closed, that you intuitively do not even attempt to talk to him about his lack of commitment and you're desire to have a committed relationship.
How many relationships he's been in is also a factor, because someone who has been in many committed relationships but has never committed fully to any one of them is a warning sign that this person is not capable of moving beyond a certain level of commitment, even though he may think he is because he has been in committed relationships before.
Unless he is willing to dig deeper and discover why he cannot move beyond that point for him, there is usually not much chance that you will magically be the one who prompts him to suddenly change that point of no return. You can talk to him about commitment or the lack of one.
EU (emotionally unavailable) man could be linked to a poor or non-existent relationship with his family, and in particular, his father.