[i]Motion 8. In order to reduce the incidence of post-match statements which defame, insult or call into question the integrity of players, officials or other participants in matches, conference calls upon the relevant governing bodies to impose a “blackout periodâ€
Personally I don't think a 30 minute cool off period would make a lot of difference if you look at some cases where the spouting off has still been going on days afterwards!
This should be something the FA & Premier & Football Leagues stand up to and take strong action over esp. if remarks are not withdrawn or apologies made very soon afterwards.