Good on not sending it, I assume he lives in denial that his alcoholism or behavior affects them. Not too long ago he stated a child has to be 6 years old before they have memories or something ridiculous like that.
Little future tripping here on your part. How your children grow up, what they think, how they handle situations, how they deal with negative things, has way more to do with you than him. Children can be raised by both parents and not learn these skills - my RAH is a testament to poor parenting by parents who are still married, and it screwed him up royally.
You are enough. I am sure there will be some issues along the way. You are enough to raise your kids into bright, successful, amazing adults no matter what HE chooses to waste his life doing.