The problem with this approach is that they have always been the market leader. And one of the reasons for their success is that they are first to market.
If they don't release before (or at least at the same time) as the Sony equivalent that is expected, then they'll have to play catch up and lose market share.
Also...if they have fully paid for R&D and now the only costs are Production, Maintenance, Distribution, and those come to say, 1000, or 1200 dollars. there is no reason why they couldn't sell the 5D at 1750, or 1800. And start selling a 6D, at the 3000 dollar price point.
All this said. My guess. They're clearing Stock. They built a Ton of these, and have stopped producing more (or started slowing production immensely) and are now trying to get stock down to the 10-15% range (1-2 months of stock) to make way for the 5D II.
I think that by the end of the year, we'll see a 5D mkII, probably announced at Photokina (hopefully sooner, but more likely then). Regardless...for me at least...i'll have to wait till the end of the year now, I spent the money I'd saved up for the 5D to refinance my mortgage.
I haven't *quite* reached "shit or get off the pot." but if Canon doesn't release a 5D replacement at Photokina...they'll have lost a customer for life...