Wow. I just spent the last hour and a half reading this whole thread.
First off, to OP, so sorry to hear about what your friend is going through, I cannot even BEGIN to imagine what she's been through.
I can however say that some of the posters who have brought up and compared this to MS or cancer really need to think again. Or have the illness themselves THEN try and make that comparison and state what they would do.
I've had MS for nearly 20 yrs. The last 7 being the worst. Specifically the last three. I have told my husband time and time again that were my condition to worsen severely some day and my brain lost function, or I could not be a wife to him, then he was free to move on. Why the hell would I want him to end HIS life because mine has? Maybe not completely, but if I couldn't be everything he needed then I didn't want him to be held back. That's the most selfish thing I've ever heard of.
As for the husband: I think so many of you are missing the point. He has the functional ability of a mentally impaired 12 yr old. I mean really? You'd judge(oh wait you aren't judging but yet you throw your "vows to god" out there as your reason why you wouldn't) but you are.
This poor woman, wow. And don't think down the line her kids won't be happier for her, if she were able to regain some part of her life, the part where she feels like she means something other then as a caregiver, because they need her to be happy, they need her to feel whole again. Because as a mother if you aren't taking care of YOUR needs, you can't take care of ANYONE else's properly.
As for the AVM, here:
http://en.wikipedia.org/wiki/Arteriovenous_malformation
Then let me tell you. An old friend's 5 yr old was struck down by this late summer. Out of the blue. She was in a coma for a LONG time. And her recovery is still a major process. she will have to have surgery again to repair one of the brain arteries. They said she was one of the lucky few to not only survive it, but to eventually regain her pretty much full functions. Luckily the friend was able to afford some of the best dr's out there and she got the best care. But it was honestly the scariest thing ever that I've heard of. And I learned a lot about it while him and his family were going through this. It is devastating when it strikes. It's extremely rare. And the survival rate is MINIMAL.
So the fact that this man has survived it is pretty amazing, but the fact that he is the state he is means he will never, ever know who his wife and kids are.
I feel for her something fierce.
And to the poster who said she would never divorce her husband even if he abused her: try it sometime. I wasn't even married but had a bf abuse the living crap out of me. I put him in jail and thank my lucky stars I WASN'T married and we didn't have kids. If it happened to you, you'd rethink that thought.