I don't think NuTSR was the inciting incident for the OGL, bur rather a pain point for Hasbro that pushed the OGL 1.1 development into a more extreme direction than originally conceived. The inciting incident was likely Hasbro looking at threats to the $350+ million dollars that they were preparing to invest in D&D One to grow it into a $1B division. When you're going to spend that amount of shareholder's money on something, you take a serious look at any potential threats to that investment. In this case, a 20 year old licensing agreement that could be used in ways not conceived of when it was created. Solasta released right about this time using the OGL, and may have been crucial in the initial direction of OGL 1.1.
Once the decision on that direction was made, WotC made a crucial error in siloing the development of the new OGL away from the people who understood the D&D community best. That may have been due to disagreements over the goal itself, and as often times happens when major decisions are in contention within a corporation. When a direction has been set and some disagree with that decision, the ones who do agree with it get put in charge of implementing it. "You worry about design, we'll worry about protecting the company."
Finally, the group in charge likely saw 1.1 as a negotiation with the existing 3PPs, not expecting to get everything they wanted, but hoping that with a strong starting point, that they would get most of it. That backfired horribly once 1.1 was leaked and the community rose up, leading to an actual threat to the $300M investment in One far greater than the potential threat of a Meta or Disney trying to buy their way into the space, and the plan was abandoned. Too much money has already been spent on One to back out of that plan now, so their only option is to compete.