The problem is that a negative right of a "freedom to leave", even if implemented, does nothing to solve the problem. In a repressive society, where are women going to get the money for a plane ticket out, or whatever other means they will use to leave? Moreover, such societies are likely to become more, not less, wiling to allow bank accounts to women if a negative freedom to leave was somehow enforced. After all, if financial freedom means leaving, then it becomes impossible for the state to survive it.

Unless we're also buying people the tickets out, I don't see how this helps. (If we are buying people the tickets out, I think it would help, although the creation and implementation of such a positive right would be fundamentally a new thing in an IR context.)