Yes, and I'm not quite sure whether the GP was leaning more towards the 'some' or the 'all' side. I've encountered a lot of UBI proponents who fall into the 'all' camp, and use that as a selling point. I think the 'some' side is what would realistically happen, and even then, I think it would only end up being a tiny amount of the welfare system that ends up getting dismantled. Simply because the people fighting for UBI also fight against inequity and getting rid of programs specifically to fight inequity will be anathema to them.