I've been playing DnD in one form or another since 84 or so. Started with 1E, but have played the older stuff later, including chainmail. I've been a staunch purchaser of books put out by TSR/WOTC over those decades of playing and still own crates of books, magazine, and boxed sets devoted to my favorite hobby. 4E was my least favorite version of DnD and I think that was mainly due to the execution and homogenization of classes. But that was purely a personal opinion and I still bought, and continue to won, all the 4E books and supplements. 3E was a golden era for me (with warts and all) because of the sheer amount of third party content that was being added.
I say this not as a brag, but as context.
The OGL has likely pushed me away from purchasing any future WOTC DnD books.
And this pains me. It pains me because a lot of my joy is seeing new rules and settings and adventures even if I don't agree with or like them. Cause even bad content can give inspiration.
Planescape is my favorite setting and I'll miss the upcoming book as a result.
Yes I know I can still use all my old rules.
Yes I know that my decision is a relatively minor one in comparison to WOTC's current revenue.
Yes I know there are alternatives and to be honest I play or have played many of them.
It still pains me though.