I predict some teams, if not all of them to various degree, will suffer from (Brexit induced) insomnia, if they aren't already. Some predictions by people close to the action regarding aviation disruptions and general on-land transport congestion might suggest teams shall be also suffering from indignation first, and indigestion later. To claim that nothing will change past March, should there be hard stop, seems rather overly optimistic, if not patently false.
Solution? I don't have it, but don't do it, as Bill Maher might suggest.