This falls on the other side of the line in the debate over technology for me.
Whether a ball is over the line or not is a simple matter of physics, a person's opinion doesn't come into it, I've got no issue with that being subject to technology and replays.
Some fouls can be obvious, but there are always those that are borderline that will be down to the ref's interpretation of the rules, and whether you agree with the decision or not, I don't believe it should be changed by anyone else. Maybe if there was some way to allow the referee himself to quickly review his own decision… possibly I'd go along with that.