If you are going to use goal line technology then you have to use replays for evey other decision that could possibly affect the outcome of the game, and that would be bloody irritating at best.
I think the best way forward is the extra officials behind the goal looking for this sort of thing and also being able to advise the Ref on penalty decisions etc, etc.
Firstly, extra ref's don't do anything, there are two reasons for wrong decisions, literally not seeing it at all(off the ball punches and things would be an obvious example that happens quite often) and the ref see's it but just isn't sure.
Replays can solve both, an extra ref solves neither as an extra ref can still not see an incident and also not be sure of the outcome, replays solve both.
As for technology being irritating, you answered it yourself. You get a set number of hawkeye challenges, realistically it can be used for EVERY single point and would be irritating and could be used as a time wasting tactic, the limit means people use it effectively ONLY when they think it could be a game changing decision and not 50k times a game.
However, I don't know why Blatter is apologising, human error on the ref's part is and always has been part of the game, every team to win the world cup to date has had ref issues in the tournaments, as has every league and other cup, thats life.
Neither the Mexico offside nor the England non goal changed the game nor caused the better team to crash out.
THe less England make of the whole thing and try and kid themselves into thinking we might have won the cup but for one shoddy decision the better.
Fact is I'm not sure realistically any poor decisions have had a key effect on the tournament so far, even Kaka's sending off hasn't effected it.
