Can Wikipedia control the vandals?

Katie writes “From the AP News story:

Seigenthaler said he wasn’t convinced the new registration requirement would stop the practice of vandals posting content that is slanderous or knowingly incorrect. Wikipedia will either have to fix the problem or will lose whatever credibility it still has, he said.

“The marketplace of ideas ultimately will take care of the problem,” Seigenthaler said. “In the meantime, what happens to people like me?””