Again, fine in principal. But you've GOT to differentiate between an interpretation (a foul, a penalty, an offside, a red card), and a line call (did the ball cross the line or not).
A TV Official should never get involved in interpretations. His opinion of the incident might be different from the refs, but it doesn't necessarily make it automatically correct.
Line calls should be sorted out once and for all by the introduction of goalline technology.
Thats it.
Where there is doubt in intepretation, as in cricket, you go with the original on field decision. It is that simple.
But sometimes there is no doubt, Lampards goal, Tevez offside (I also think that offside is a line decision with the lines that they can put on the TV screens). These being so fundementally wrong make a mockery of the game.