His eyes lifted, "since we got the 5D2 - 3 years ago, we haven't sold a single 1DsIII. At 3 years the 5D3 would be more than a suitable release and more than able to match most of Nikons plans, It doesn't even need that much work to get them selling in volumes quicker than Canon can produce them, and certainly the equal of any D800 nikon might have to offer! This would leave Canon till Christmas to sort out their 1D stragey ready for the games..."
You've actually raised an interesting point:
There is a rather limited market for the 1DsIII - most shops, with the exception of pro dealers would not have sold many 1DsIIIs anyhow. On the other hand the 5DII sells like hotcakes.
Even if the 5DII has cannibalised a lot of 1DsIII sales, the net result for Canon has probably been a good one.
It would not surprise me if the higher volumes make for better margins on the 5DII. Is there anyone who has specific knowledge of this? (I mean margins for Canon, not for distributors and retailers.) Canon cannot go to market without the 1DsIII though, as then they would give up ground to Nikon.
If however Canon appeal more to the medium format market with the 1DsIV, that may change things.