Forget introducing technology only to clear up goal-line incidents; lets just get the ref replaced by a computer and an adjudicating panel!
Have a group of neutral ex-footballer adjudicators sitting in the stand, they each have access to cameras along the lines of the pitch and a feed into the TV broadcasters cameras and also a keypad with the following buttons: foul, no foul, offside no offisde, goal no goal, yellow card, red card.
Each time all of them hit a buttong on a foul or particular incident an electronic whistle/hooter sounds to indicate an infringement. then an electronic scoreboard can show whether it is a card offence, goal, offside etc
time for a lie down i think