What are the chances of a narcissistic person getting better if they make an effort to get help?

I asked my therapist about this, and she said it's so rare for them to admit they need help, it is doubtful, although anything is possible. If everyone left them, and they were all alone and had no one shelling out Narcissistic Supply for them, it's a rare possibillity. In my ex-N's case, it is very doubtful because he's such an attractive man and has such a following of women and Narcissist supply, it's hard to imagine him being all alone. He'd just shun the one who labeled him a narcissist and run to get his adoration elsewhere.