Yes, it might well, nay would, have changed the momentum of the game*. No, video technology is not needed (not least because it hasn't improved any game in which it has been introduced). And anyway, to adapt Wodehouse, what you gain on the roundabouts of 1966 you lose on the swings of 2010. Consider this, then, an open thread to moan about the World Cup:
*I didn't actually see it since I was playing cricket. Against Langholm. We won. I took, rather astonishingly, two wickets. It should have been three. Or even four. But that would be greedy and massively above and beyond expectations.