Wtf, You asked what if you reconnect, start a family and then your WH returns to his addiction, years later. I think you have asked a very important question, one that maybe nobody here can answer. I can only speak from what I have seen, and I am not trying to scare you at all. You sound very much in love with him, and understandably you have hope, too.
I will share that my ex-brother-in-law was a "sex addict" (an attorney, my late sister a SAHM.) During both of her pregnancies, he had cheated on her, she later found out (I don't know how much later.) He claimed to want what your husband says he wants, a complete change of heart and a new commitment to their marriage. She gave him that second chance. He "got religion," semed like a new man to her, and she told me they had 7 good years together. Eventually, he wanted to have another child, wanted to try for a boy after 2 girls. So at age 42, my sister went ahead with a pregnancy, and the baby boy was born with Downs, unfortunately. It was at that time she found out her SAWH was back to his addict ways, trading his legal services to hookers and drug addicts for sex in his office, and would come home to her and have unprotected sex - the same night! She filed for divorce, it was terribly bitter, and he ended up losing his license to practice law. All because of a deep-seated issue he was never able to eradicate.
I know a woman at my church whose husband did the same pattern: he found religion, talked her into renewing their vows, they had another couple children, and later on, she discovered his prostitute habit. He had somehow managed to pull $50,000 out of their house with a second mortgage that she knew nothing about - her divorce attorney discovered this.
In my case, my SAWH was in "remission" from his prostitute and porn habit for what I believe was 12 years. We went through terrible times together after D-Day 1, but by 11 years after D-Day, I had hopes we might still make a new marriage, even though my SAWH never appeared any different to me, other than he quit ogling pretty blond women, when I was with him. One fine day, 12 years after I decided to stay and work it out with him, he was arrested in our little town for: soliciting a prostitute.
So out of 3 real life cases I am familiar with, all 3 men had this pattern of remission for years after their sex addiction was exposed. But none of those men were successful in their "recovery." During those long years of not acting out my husband claimed he never struggled with sexual "urges." From what books I have read on this addiction, that is not the usual story. Most sex addicts struggle with their urges to act out, and slip more frequently. So, I just don't know what the odds are, really, but you are very wise to be taking care of yourself, right now. I hope you can find a good IC who can help you, one who has experience with betrayal of this kind would be the best.
Edited to add a 3rd case history.
[This message edited by Superesse at 1:15 PM, August 12th (Sunday)]