Holy moley, what a pickle. Your description of your wife makes it sounds like she's a child or a mentally impaired relative. And I guess she is mentally impaired. Can she qualify to live in some sort of a group home?
So she won't be a burden to you the rest of your life? Or is she not bad enough? If she's not bad enough, maybe she'll get better? I agree, you need to get to Al-Anon. And keep coming back here, it's great support. Sorry for your situation. Stay strong.