Hi.
Well yes, tech does always get old, but this is probably a bigger step than most.  New tech is expensive, but it usually causes prices of older tech to go down a fair bit when it's released.

Intel releases a new architecture roughly every two years (SB due in early 2011) and AMD's next chip is meant to be a big change.  Optimal time to upgrade is probably a short while after the new tech is released, rather than shortly before.