Is there a case for a transfer window?

Whilst meeting with Karen Traill (Chairperson of our Parent Council) today, Karen suggested consideration ought to be given to teachers not being able to move from one education job to another other than at specified times in the year. This would have the obvious advantage that disruption to pupils' learning would be minimised. This would mirror the arrangement in professional football, where, for example clubs can only transfer players between each other during certain times of the year, referred to as 'transfer windows'. For example, the lead up to the examination period in May would be an obvious time to avoid. I understand that some private schools ensure that contracts always run for a whole session. If this arrangement can work in the world of professional football, could it work in the world of education? Are there examples anywhere in the world, where such a model operates successfully?