Oh, boy, not sure I'm ready to give up the 80-400 especially with the idea of going to an FX body in the near future.
I hear you on the 70-200VR, Mark. I used it at AK and DHS on my last trip. At DHS, I kept it in a locker until I needed it for a couple of the shows. DHS isn't that big so going back to the locker wasn't a time killer. Since AK closes around 5pm, carrying it for the day wasn't hard and I had a bag to put it in when I switched lenses.
Having said that, I very happily used my tripod like a monopod during Fantasmic! Worked like a charm.