For years now they've been able to look at offside decisions, ball crossed the line, penalties etc from the commentary/pundits position using normal technology. There a few examples when it's less clear cut, but football is making a proper pigs ear of it. As for rugby...and cricket for that matter, it actually makes it more interesting for a lot of spectators and really doesn't impact on the time in a game. Maybe a couple of minutes but you can't compare it to watching a three hour ad-fest like American football.