It's almost certainly not due to "gnashing of teeth." They've always marketed the MacBook line as a general computing device for power users. The idea that they would make it impossible for developers to use their primary computing product is ridiculous. They know how many of these things they sell to students, developers, etc.

Just a note - it's often very easy to measure the validity of your ideas by considering the economics of the ideas. Apple effectively neutering development on their premier general purpose computer would obviously reduce the amount they sold. The same isn't true for the iPhone, which effectively no one develops on.