It wont make an ounce of difference, in my opinion. If the hooligans choose to fight now they know the consequences and to be honest they're not going to Portugal to admire the architecture or to watch the football.
Strangely though it does seem to be a problem most attributed to English footballs fans (although the Turks aren't far behind), I wonder what it is that other countries do diiferently that deters this kind of behaviour.
