You have some interesting thoughts, but, have to agree with you on weight. I have 70-200 F2.8, and I dont mind it, BUT, I went to China, Thailand, and Cambodia about 15 months ago. Packed the bag and it was so heavy that I had to discard some things.
Took the 70-200 F2.8 out, and put a 135mm f2.0 AF-DC and 180mm f2.8 AF in. Both lenses are around 20 years old, yet they served me well on the trip.