Not sure your wife is in MLC though. If she's not trying to act and dress much younger, working out like a mad woman (much thinner), staying out late and partying with "new" friends, lying about a number of things, and of course, gives you the ILYBIDLY speech, then it's likely not MLC. Thank your lucky stars!
However, from reading your sitch, it does sound like your W has been haboring her resentments for a long time. My bet is she's got some pretty caustic advice from someone who just stoked her resentments over time. Take her advice and start being as amicable as possible. You will see a big change in her attitude. You may still end up D, but your choice is to have a "bad" or "worse" time in the process. I choose bad.
It sounds like to me she does love you still. Is there anyway to press for an extended separation period of say, 3 to 6 months, to let things cool down some? Is there any way to get away from your attornies and into mediation? This also helped cool our sitch down immensely.
Good luck to you. All those kids under 10? That is harsh man, just harsh. It really takes two parents to manage that many little ones effectively. Hang in there with your stress. Just agree with your W, no matter how "right" you feel you are. You will not win. But you can make your "new" relationship with your W much better.