As has been pointed out, even in tennis Slams Hawkeye is only used on show courts, so the across the board argument doesn't really work.
I honestly hope the World Cup Final is decided by something like this - FIFA will absolutely have to act, their hand will be forced. Or they'll just muddle through it (like Zidane's sending off 4 years ago, which I still think came about via the 4th official seeing a TV replay, although FIFA will never have us believe that).