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lenses will drop in value no matter what, but usually brand names don't drop as fast as 3rd party lenses.
it also depends on how saturated the market is... if there are a bunch of a certain lens, then the value will drop.
You don't have to worry too much about lenses being superceded in the future because they don't get updated as fast as elecotrnics do. A bunch of Canon Ls have been around for many many years and haven't been updated at all - glass is glass, manufacturing methods may change but the basic physics stay the same.
I personally try not to buy lenses new because you lose a certain amount of money as soon as you walk out of the camera store, but sometimes it's good to buy new (or buy used but get the reciept from the seller) to get the longer warranty offered by the manufactuer.
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Nikonian
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