I tend to agree especially with the 600/800mm f11 being so light/compact/cheap.I simply don't see Canon releasing a zoom that goes past 500mm natively; I would expect at most a super-expensive supertele zoom like the recent patents, along the lines of the 200-400+1.4. They added 100mm on to their standard L long zoom (100-500 replacing the EF 100-400L) and both that and the consumer RF 100-400 are compatible with teleconverters, so I think they will feel it's covered adequately.
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