Amrûnril
Adventurer
I spelled that out in the OP. The numbers just aren't there. There is no statistical correlation between Hasbro's stock movement and the OGL.
Weighed on the scale of Hasbro's overall finances, the costs of attempting to deauthorize the OGL were likely small. But the costs didn't just have to be absorbable, they also had to be worth the perceived reward. Evidently, the Hasbro/WotC leadership stopped beleiving that to be the case. Which I think was clearly correct, even from a cynical business perspective. The OGL dispute was a bigger threat to the success of WotC's VTT and other future products than the OGL itself ever was.