From someone who spent 20 years of her life married to someone who had great potential, I ask you......
Are you in love with him as he is? Do you want to spend your life with the person you are with RIGHT NOW? That is the only person you can count on him to be. Not who you think he could be, not who you wish he was, but who he IS. Is that the person you are willing to dedicate your life to? Because, if you don't love him exactly the way he is, right here, right now, then you are only kidding yourself. This may be the best it ever gets. Is that good enough for you? No? Then get out. It's not fair to him or you to make your love conditional on his improvement. How would you feel if he told you he would love you, but only if you met certain criteria which he laid out. You are possibly okay the way you are, but if you want his everlasting love, you have to do X, Y, and Z. Not very nice, is it? That's what you are saying if you love him for what he could be.
Either you love him for what he is, or not.
L