At the risk of sounding like a broken record, I would say that the primary barrier is still stigma. It's still whether people seek treatment or not, and whether people who are around them are willing to recognize it also. So you're hypothesizing that we have all of the capacity, but not necessarily receptivity.
The other thing I would say is that barriers exist around social determinants. And we face this in hospitals all the time. We may do a perfect job of treating someone and stabilizing their illness, but if they're then going back to a very bad living situation or they're going back to no employment.... And of course we know that people who have been in psychiatric institutions have a much higher rate of unemployment. I'm sure it's very high among people coming out of correctional facilities as well. If we don't take care of the social determinants--people's connections to their communities, decent housing, income, and those sorts of things--those are going to minimize the effects of treatment very quickly.