Actually, the 2000 figure (attendance per week, as many churches do not have actual members) has been true for years as the average membership in churches in the US is 180, IIRC.
Someone recently coined the word "GigaChurch" to describe churches that have weekly attendance of 10,000 or more.
My church falls into the latter category.
In violation of scriptural occupancy limits, too! :-)
The biggest problem with a giga church is that you have to be really really good to make it into the worship group. Our back up guitar player is a five time grammy nominee.