The goal line technology was long overdue as the Lampard goal showed. Thats just Blatter being the **** he is.
But goal line technology is quick and indisputable. All other decisions are not. Offside decisions are possibly the closest to it but even then there is margin for error and it would...
I'm in the no camp. Seeing it on rugby is painful. Only sport which lends itself naturally to it is cricket as it is a "slow" game anyway.
And also controversial decisions are a part of football.