I'd like to say two things about that.
First, it's true that very few people are going to have access to it if we follow our recommendations. At the same time, these are similar recommendations to those of countries where this practice is allowed and where very few people have access to medical assistance in dying. If they have little access to it, it is precisely because there are many treatment options.
We should ensure that people have access to care and services. A minority of people will find themselves at the end of a long and dark journey caused by mental illness, but this could happen if "incurable" were defined that way.
Secondly, with regard to exclusion and the notion of social consensus or acceptability, I hesitate. Sometimes, what is socially acceptable is not the right thing to do. Not long ago, homosexuality was not socially acceptable, whereas driving while intoxicated was socially acceptable.