Do you not agree that Canon tends to play this a bit more than other manufacturers? Canon releases gear, and then they don't manufacture to demand. They've actually brought the numbers down, to the point that even if demand is less, there's still a perceived demand because they simply aren't cranking the gear out fast enough.
No, I don't agree, not at all. For every manufacturer, especially for Canon and Nikon, there is rather short supply in the first months when demand seems to be frantic ("seems" because web hysteria makes it seem worse than it is), then demand levels off to meet the planned supply.
Manufacturers will not size production capacity to meet that initial demand. That would be stupid resource management to set up assembly floorspace, hire and train additional skilled workers, et cetera, just to mollify 30-60 days of silly Westerners kvetching on the Internet.
In this current economic situation, Canon is doing the same thing most manufacturers are doing--reducing the workforce, cutting assembly lines. They've laid off thousands of workers in "offshore" plants and moved assembly of many of those devices to Japan. They've stalled plans to build at least one new plant, and are likely reserving floorspace in existing plants for the devices they would have built in the new plant. All of that portends less manufacturing of many lines.