Very true. Montiero is unstoppable lately.
In The Internet Industry™ specifically, the same timeline might also produce two indistinguishable chairs, and then a trend which could spark a more focused critique of their real-world sit-ability and in turn produce even better functional design. There's some value there.
Unless they were parallax chairs. Nobody actually likes those.
The web industry has gotten to the point where critique and discussion of more functional design is a regular occurrence, which is great for everyone in the field. I'm not sold on the fact that any two sites are indistinguishable. There are templates and conventions that I see repeated ad nauseum, but the overall experience of a site relies on a lot of more subtle factors (speed, flow, micro-interactions, community, support). Taking care with the craft at each of these levels helps separate sites that would normally appear the same.