My LBS recommended cartridge hubs to me. Here are my doubts.
Seeing as how I never ride in the rain or any such wet substances, I don't really need the "completely sealed" feature.
Sheldon Brown says that if taken care of, the body of a loose-ball hub will last indefinitely. (not the balls and cones). So if you maintain your hub, you should be able to indefinitely avoid having to re-spoke your wheel.
Sealed bottom brackets make sense, because it's easy to pull your cranks off and swap it out. But if you have a cartridge hub, when it wears out you will need to re-spoke your wheel. Am I right about that, or do cartridge hubs have a system for just replacing the bearings?
Also, is it possible that a cartridge hub would last as long as the rim? Then you would just replace the whole wheel once it started having problems.