WW1950!
Simple! They'll compete with each other. More tax money is going to be wasted on airport fencing and other useless crap. As one (or more) ppruner has mentioned before, all the hysteria outcry goes out to aviation and GA, but you could still turn a rental van into a WMD. That's what I call blowing smoke!
But I think that this incident might put an end to GA in Europe. GA will simply become unafforable.
RIP GA in Europe? I hope not ...
edited:
one more thing. How do/did countries handle GA airport security in which terrorism was or is a clear and present danger? (NI, Israel)