seeing companies updating their flagships every nine months make's me happier with the Sennheiser approach.
"Here's your flagship HD650. It's all you are getting for the next seven years, so spend the money once and relax because they are awesome"
seven years later:
"Here's your flagship HD800. Its the best dynamic can ever made, because it took us seven years to make it. It's all you are getting for the next seven years, so spend the money once and relax because they are awesome."
Having said that, here is hoping for the HD800BC v1.2 (Bone Conductor Version) in the next three months. Only $300 more than the HD800 and it vibrates your jaw.