Most other programs are just fixing the old system not really doing away with it. Each state has its own rules regarding disability. Most are not disabled and on welfare. If the parent is disabled the child may be on aid, often that's what going on. Some time it is the child that is disabled and the parent is on aid in order to stay home with the child.
Most states allow for that.
But I'm sure there are some. New Zealand has been trying to follow the Wisconsin model. I don't think they have taken it that far yet. I think each state should be allowed to put in what it feels is best for its state. We are so different state by state in the US, that one model will not work for every state.