I'm not surprised by these licensing changes at all. The
OGL, while great for information freedom and innovation, is not so great for profits. Like it or not,
WoTC is a for-profit company. They have to pay people to produce their products, and in order to sustain their existence, they have to sell those products so they can continue paying their employees.
It amazes me that
OGL has existed for as long as it has. It's far more like an open-source sofware license than something you would see from a for-profit company. I will give
WoTC credit for their guts in publishing under that license, but to be realistic, it
is too open.
I don't think closing things off a little will hurt innovation that much. In fact, it might spur the development of a few new game systems. Maybe even one that's better than d20. People will not stop creating content just because they can't use
WoTC material. At least, the people who really just love to play RPGs won't.