http://www.slate.com...use_tennis.html
First, limit the number of incorrect challenges only. It makes no sense for a team to get two challenges, be correct on both of them, and then … be utterly dependent on the whim of the umps. A penalty for incorrect challenges ensures that they won’t be used frivolously (except maybe at the end of a game, where there’s little to lose; tennis has this problem, too). One or two incorrect challenges per game seems about right. (A lot more balls are hit during a tennis match than during a baseball game.) However, teams should get one more challenge should a game go to extra innings.
Second, shift the responsibility for challenging from the manager to the players. Most of the disputes will involve force or tag plays, where the runner and the fielder are in the best position to know what happened. In tougher cases, as when a line drive that may have bounced is ruled caught, the temptation is to let the managers challenge, but that’s only because we’re used to the spectacle. The manager will rarely if ever have the best perspective on the play, so let’s stick with the players. The contesting player closest to the ball can make the challenge. In the case of the player who hit the allegedly caught ball, put the burden on him to argue that the ball was trapped, not on the manager. If the player is lucky, there might be another baserunner from his team with a better view of the play, who could then challenge the “out” call right away. If he’s unlucky, well, that’s baseball.
Finally, let the fans see what’s going on. If MLB does nothing else, they should do this. Whatever multiple angles the folks in the Replay Operations Center are seeing, the fans should, too, and at the same time. Baseball doesn’t have Hawkeye, but never underestimate the power of a dramatic moment in making fans feel included and a replay feel authoritative. As each of the many angles is shown, fans can groan, or whoop, or just break into small discussion groups. Then the remote “Voice of God” can announce the verdict. Since the conclusion can’t be as clear as the in/out call of tennis, some will still moan. More’s the fun.