Argument: Health insurance cooperatives are not very portable
Rick Moran. "Health Insurance Co-ops Too Much Like the Public Option". American Issues Project. August 18, 2009: "Health insurance co-ops wouldn’t solve the problem of insurance portability either. If you were a member of a co-op in one state, and moved to another, you would have to buy in to their co-op with no guarantee you would have comparable insurance coverage." This is partly a chicken-or-the-egg problem. Because co-ops are not yet widespread, people will not be able to take plans from one state to another. And because they cannot do this, they will be seen as inferior to private insurers that already have this attribute, and will not scale.