Bottleneck blog - one hit wonder?

Steve Lopez' Bottleneck blog about LA traffic is up to an incredible 602 comments on his first post, but comments have steadily declined since then. Subsequent posts have 116, 52, 19, 5, 0, and 2 comments. I guess he made a big splash and then dropped back to reality. Or maybe that first question was just so good that nothing could match it. I'd still be happy with 5 comments on anything I've written. On the other hand, googling "Bottleneck Blog" comes back with the original site at 1 and 2 and this site in 3rd. Maybe nobody else wrote about it...