Wikipedia loses its nerve
In actually, I don't think this will have a deleterious effect on the quality of quantity of Wikipedia's content. However, in principle, Wikipedia is saying that a) people can't be trusted, and b) the community is not powerful enough to correct itself. It's a disheartening admission.
UPDATE: According to the comments, Wikipedia's move is much more modest than the CNet article reports. They are not doing away with the ability to work anonymously. Instead, they are forcing users to create a username before creating pages. But crucially, a username doesn't require any identifying information. So people can be just as anonymous as they have always been — there is just a slightly higher barrier to entry, and hopefully a higher barrier to vandalism.