
I'm sorry for what you're going through but glad you have found a community where many of us have been through similar experiences, and we can learn from each other.
I think Iluminati gave some solid advice and I support both of the points he made about your therapist. In my opinion a good therapist should stay neutral while supporting you in making a choice that only you can make, as you are the person that needs to live with the decision.
What concrete steps would my wife need to take for me to give it a chance?
Thats a question only you can answer but this site provides excellent support for you to find out. You will find a lot of people here to talk to, who will provide you with support and some good advice.
How can I be sure I'm not fooling myself?
Whenever I am feeling discouraged and hopeless it helps me to read success stories from the board:
https://bpdfamily.com/message_board/index.php?topic=113820.0My situation is very far from perfect but there has been immense improvement since I discovered bpdfamily. Me and my pwBPD have good weeks and bad weeks but the bad ones are mild in comparison to how things were when I first joined.
Is there any hope, and if so, how can I tell?
The short answer is yes there is hope. The long answer is more of a conversation than a concrete answer and brings up some questions: What exactly are you hoping to change? What is your time limit? Iluminati suggested giving it 6 months. I think thats a great idea especially if you really use this time to study up on the disorder and also examine your own reaction to your wife's behavior. It might be a long time until she is ready for therapy. It also may not happen at all. But what we learn here on bpdfamily can make our lives with our loved one with BPD a lot easier.