It's the World Cup; it's all a joke but let them play with their machines. At least it won't be affecting our games unless they call upon the crowd to judge offsides and bad fouls and cheer or boo accordingly.
Thinking back to Frank Lampard's thunderous shot , so obviously over the line , why fear anything ?
The camera angles , slow motion and super high definition are here to stay , at least in the top leagues and W/C etc.