Why?
What did the OGL actually do? Very few OGL products actually sold in any real numbers, there was a very large number of dross for that bit of gold, and, by the tail end of 3.5, virtually no one was doing any OGL products anymore for D&D. You had what, 4, maybe 5 OGL producers for D&D before 4e was even announced.
The OGL did get 3e on the shelves, but, I am constantly bewhildered by this unquestioned view that the OGL was the driving force behind 3e. 3e did fantastically because it was a very good game, at a perfect time (no new edition for about a decade) and some fantastic marketting.
Put it another way, what percentage of those buying 3e/3.5 books bought OGL products. Of those that bought OGL products, what percentage did those OGL products occupy of what those people spent on D&D?
I look at my own group, and I was the only one for a long time buying any OGL products. I'd try to use them in game, and very, very few DM's would ever let me. When I introduced them for my own games, players never took them up. It was always WOTC or nothing. It was years before anyone actually started seriously bringing any OGL material to the table.
4 or 5 competitors is huge in this market. Beyond that, WotC was very good at releasing "new" content splatbooks that were rehashed OGL. The OGL's strength wasin its CROWDSOURCING not in the products themselves. Pathfinder, as an OGL product, is giving WotC/HASBRO a run for their money. Yeah, and its only one OGL competitor...that is all it takes: one.
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