I have seen this happens only more...the game shape down is what we call "too little too late".
It wont stop it and people will keep doing it,why not change the deadline to match real life rules? isn't the game suppose to be realistic?
If it dos'nt change then all managers will aim for the end of season buying and the game will lose a lot of it's fun,not even mentioning the drop in players playing a game that repeat itself every season...long term damage to the game community.