I think that it is possible that your wife will change her mind, but only if you give her a reason to do so.
You can't tell her that you WILL change; I think that you must take immediate action to work on your habits--to improve yourself for your own sake. Obviously, this crisis must have sunk you even deeper into depression, but you can start with some simple things (at least they sound simple, but they are hard to do at first).
Do not initiate contact with your wife. When you do speak to her, be brief but friendly and upbeat. Just fake it. And listen (sympathetically) more than you talk.
Don't fight her about the divorce. There may be ways of slowing it down, but it should not be too obvious to her that you are trying to stand in her way.
Most importantly, try to exercise or get involved in hobbies: try something different, something to take your mind off this as much as possible---something that will make you seem more interesting as a person.
There are no guarantees, but some people have been successful---and you MUST have a positive attitude, if it kills you! Please do get Divorce Remedy and read it carefully. I'm sure you will find it very useful.
