CharlesRyan
Adventurer
I also don't really believe that there was a glut of d20 materials.
At Gen Con and Origins the past 2 or 3 years, there have been multiple stands selling stacks and stacks of RPG product, predominately d20 product, predominately hardcover product, at 3-for-1 or 75% off or other deep-discount prices.
Huge inventories have been landfilled by the 40+% of game shops that have gone out of business over the past 5 years, the multiple distributorships that have closed, and the many, many publishers that shut their doors while still holding pallets of products in their garages.
The d20 phenomenon generated sales of untold thousands of books by many publishers. But for every book sold, there was another that entered the channel but was never purchased by a consumer. The money spent by the publisher, distributor, or retailer on that book was effectively a "tax" on the d20 phenomenon--money spent that generated no return.
Imagine the state of our industry if the publishers, distributors, and retailers had made all the profit from all the books that were sold, without having that profit sucked up by all the books that didn't sell! It's that potential that a more restrictive open license might achieve. The GSL might or might not prove effective in that regard--we'll all just have to wait and see!