Hi Hmcbart
I have no personal experience to share that might be helpful, I'm afraid, but really just wanted to say that I'm cautiously excited / happy for you.
Therapy can certainly help, both for your wife and perhaps some for yourself too, if you feel you could do with the extra support. I think you will find many very wise and experienced members here who will chime in shortly and I'll be following the thread with a lot of interest.
It sounds like you managed the conversation well. I can certainly appreciate that it feels like a momentous thing to have your wife (possibly, hopefully) have an insight into her own psyche and behaviours that she might be able to accept responsibility for (in measured and hopefully progressive) doses.
For now, maybe if you focus on the lessons over here on the right ---> to help yourself stay focussed and maintain the all important boundaries. As you know yourself, these will serve not only you but your relationship. This is a good time to be validating and gently encouraging and stay practical, as you've suggested already.
Wishing you well, and keep taking care of you.