I think the chaff will fade away but not the real traffic from real review sites. If marketed right, handled well, they will continue to provide good steady income and traffic. The trolls who try to leach off the idea will fade away to try their hand at something else, and that too will make them fade away leaving the real webmasters to continue to make bank and increase their business.

It is about work. Many of the things that were hot ten years ago still earn good income for many, who took the time to understand their product, their niche, their customers and built on it as the internet evolved.

Free content is really not the evil so many are quick to label it as. It is the inability of many to properly use it.