Hamilton--How Far Away Is Remote Proofing?

Yet remote proofing is used for just a small fraction of all print materials produced. Why? If service is one of the primary differentiators between companies—a debatable point—then wouldn't it be wise for printers and prepress service providers to offer remote proofing to their major clients? And with virtually everybody connected to the Web, in many cases via a T-1 or other high-speed wire, shouldn't this methodology be taking off like the proverbial rocket?