I think that Malcom's advice is right on. Your DH knows what is right. He knows the consequences of his actions. Don't lecture him. Don't judge him. Be his example. I know that the gospel has been a bond for your marriage, but that isn't all of what your relationship is about. What are the good things he is doing now? Why do you love him?
My father isn't a member and all three of us children are active in the church. Two married in the temple and one RM (not married yet). My mother never pushed us or my father. We decided our own path. She brought us to church, but never fought us on it.
Believe me, your husband will feel the nagging by the children. They will ask why he isn't baptizing them, like their friends dad's, etc. Your DH will feel it. Be patient. Be his loving wife who champions the good things that he is doing in his life. Hold your tongue about the wrong choices or you will push him away more. (You may need to find a friend to talk to when you just feel like exploding from frustration instead of exploding on him.)
As for your doctrine based questions, I am pretty sure that you can only be sealed to another person in the next life who is worthy of Celestial glory. That means that you will find someone else, if your husband doesn't make it. But, why worry about that now? Think positively, your husband may just change his mind and make it.
As hard as it is, and believe me I know it is hard, he may be going through something. Or, he may just be tired. Let's face it, being LDS can be exhausting with 3 hours of church plus callings, HT/VT, keeping the sabbath holly, and helping those in your ward who need help.
Love your husband. Let him know that you are there when he wants to talk and that you won't judge him. He will come around, it just might take a long time. Pray, pray, pray.