Causation is the other way around. The default(s) will become lower quality, as a direct result of the additional, unfiltered attention. They will get firehosed with a larger audience, and the number of participants will grow in a way not compatible with maintaining a consistent community or personality. Additionally, the switch in community growth from a "pull" model (I'm interested enough in X to actively search for communities about X on the internet) to a "push" model (X was pushed in my face, and I care enough to respond) will tend to dilute the focus and quality of the community.