I'm 100% sure that the OGL was
massively beneficial to WotC, and those that wrote it
knew that it would be. (Though I disagree with
@Parmandur that it was ever cynical - a better phrase would be
calculated. It was a work of marketing genius.)
That typical short-sighted company suits might look at other companies making money with "our game" and be (very short-sighted) jealous enough to think that the money would somehow come back their way if they rid themselves of it? That's just typical short-sighted foolishness of middle and upper management-types. It's not new, it's not surprising.
One of the reasons that I'm constantly baffled by those that go on about "trust" being "lost" with WotC. WotC is not a
person! It's a company. As such there are people that are "on our side" (in that they want to produce a good game that we all enjoy playing) and people that are not (in that they would like to reach into our wallets and take our money without giving us anything in return). And people in-between.
Some
idiot(s) thought that revoking the OGL was a good idea. They were powerful enough in the company to almost succeed. They were
proven to be wrong. Could someone in the future be dumb enough to try again? Maybe. But for now, it's over - it was a bad idea and the company (currently) knows it.
There's no trust to be had and no trust to be lost.