I know that past editions had a boom/bust cycle over its lifetime in regards to revenue, which also explains the hire/layoff cycle we have seen. I also see what apears to be a level of failure with regards to the new strategy
WotC was going with to try to stop that cycle in
4E.
WotC made several decisions that were supposed to level the income stream over the life of the product. The core books were intentionally limited in scope with PHBx, MMx, and DMGx coming out every year so that the first 3 books would no longer be considered all that was needed. This would to some extent match the yearly MtG product cycle where new rules/power systems are introduced each year. Then the
DDI was also designed on a subscription model so that a consistant revenue stream would be coming in each month. It seems to me that these attempts to flatten the revenue stream have not worked out so far.
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Brain: Come Pinky! We must prepare for tomorrow night.
Pinky: Why? What are we going to do tomorrow night?
Brain: The same thing we do every night....TRY TO TAKE OVER THE WORLD!