I think it's worth exploring; however, I would caution that living on a boat is a lot more complicated than landlocked housing solutions. If we are, potentially, going to be putting people with mental health issues and people who are currently not housed into a boating environment, they will need training.
Also, a lot of these abandoned boats are not suitable to live aboard. They don't have heat. They often don't have any kind of black water containment.
I would say that it's worth exploring. However, if you were to choose to pursue that avenue, there would need to be some pretty strict parameters in place to guide the process.