Great advice Jazz, tho, I imagine 25yrs has already done this.
For me, this would be a no brainer. I would not go. But then, I'm on the other side of a D and know that life goes on and in my case fabulously!!!!
To me, it seems that you're making 95% of the concessions and he's making a lot of promises. Do you really want to disrupt your daughters at this point? My feelings are that as long as you're ambivalent, stay put. The fact that you're not giddy and dieing to leap into his outstretched arms says a lot. There comes a time when it is too little too late and that may be where you're at now.
In either case, I wish you the best of luck. You sound like a wonderful lady and you deserve the best. Make sure you get it!!!