People are overreacting big time to this. Pulled offers happen. Beck should have called him sooner, but at least they told him before he made a decision. This doesn't mean Nebraska is going to go "SEC" and start oversigning and pulling offers everywhere.
The last time this happened and it was a somewhat significant deal I think was in '09 with the Pennsylvania kid who played FB/C, and if I remember right, he had actually committed and we pulled it.
Recruiting sucks sometimes, but that's just how it is. As others have said, this probably spells good news for someone who would be just as capable as Vandenburg, but would be a true freshman.