Salon's King Kaufman reluctantly approves of MLB using instant replay, but he's worried about the ol' slippery slope ...Point of Order: Nobody's talking about changing the rules. What's being discussed is enhancing the enforcement of the rules. Let's assume for a moment that instead of four umpires, each major league game is overseen by only two umpires. Calls are being missed all over the field, and everyone watching at home knows it. Suddenly, someone has a crazy idea ... Why not add a third umpire, just like in the Triple-A leagues?You're not changing the rules; you're simply making it easier to enforce them. Do you wait until after the season to add the third umpire? Maybe ... Except all the umpires in the majors came up through Triple-A, so they should be able to handle the transition to a three-man crew without much trouble.Well, that's what we're talking about here. Except it's a guy in New York rather than a third umpire. And while the current umpires have not previously worked with a guy in New York, the NHL has used a guy in New York (or wherever) for some years now, and I have to think MLB will be talking to the NHL about protocol.Granted, the transition might be clumsy. But it doesn't have to be. And nobody's changing any rules.Now, about that old slipper slope ... What sort of "assurances" would be worth a pail of warm tobacco spit, anyway? Sure, MLB can say this is as far as it'll go, but what's the point? One year, two years, five years down the road, absolutely nothing would prevent a change in policy. So I don't expect MLB to make some empty gesture at this point.And I wouldn't want them to. Maybe today the guy in New York seems appropriate only for those home-run calls. But don't you think our sensibilities might change? Here's a prediction: Within five years, the expanded use of that guy in New York will be supported by even King Kaufman.Probably not George Will, though.