Well I guess if you're (not necessarily YOU op) the type of person who buys a car and moves on to the next one quickly or if you think it will be some kind of investment then yes it will take a hit on the used market because many will trade up to the newer style and flood the market with quality used cars.
I could feel the same way for having a 2010 2SS and now the 2013 has improved handling, electric PS, HUD, Mylink, Nav, backup sensors, backup camera, 1LE, convertible, ZL1, Frameless mirror, etc. All those things drop the price of my car, but who cares. I love my car
and love seeing the improvements they keep making. The 6th gen will just be a giant improvement!