What is interesting to me about this chart is thst the product releases seem to pick up juat as the initial D&D fad ended and we know from Riggs et al that sales were collapsing. Sonwhen TSR was healthy was when product releases were on part with 5E....I posted a slightly different version of this graph in the thread from which this poll was spun off, but for comparison, here it is again. I counted only RPG products released by TSR/WotC, and not licensed accessories from 3rd parties. The release pace for the last decade is the slowest since the 1970s, at least in terms of the number of products.
Correlation is not neccesarily causation, but sometimes there may be something there.