Upload & Sell: On
I think Canon will feel at liberty to charge $20,000 for a 800mm IS II that is say... 8lbs?
I think $20,000 would limit the sales severely, unless they would go for the DO variant.
Then we might have a 3kg light EF 800mm f/5.6 DO IS USM which would be very pricey indeed, and very desireable too, assuming the lens IQ would be commensurate to its price.
Because being extremely light at the expense of a compromised IQ, wouldn't sell a $20,000 lens very well.