I voted "no" as well, but I wanted to note that a comparable game, cricket, has used video replay reviews for quite some time, I think. Not a challenge system, but if the umpire thinks the play was close, he'll make a square with his fingers (like Uma Thurman in
Pulp Fiction 
) and the video official will come back with an out/safe light on the scoreboard.
Of course, the things they're trying to compare aren't as close together, spacially, as a tag and the base (or even a stretch at first and the base)... it's seeing if the wicket was knocked off with the ball before the player's bat touches ground across the safe line... or something like that... been a while since I caught a match on Fox Sports World
