I have to agree here, My W swore that I would get the house as long as I let her have certain things. I gave her all that she wanted and now I got a "Final Decree" from her lawyer and guess what? She changed her mind! Now I find myself without any leverage and no way to hold her to her "word" (and an MLCers "word" isn't worth spit!). I know you want to save the M. I know exactly how you feel, like by holding him to the 2 years will give you a "chance" to work things out, etc. If your H was in his right mind that might be the case. He's not. He is deep into his crisis and that time will most likely only hurt you getting the best deal you can for yourself and family.
This is your decision and in the end you need to do what you feel is best. But from my own experience and those on these boards, take it while you can!