Apparently Zeldman’s accusation that 99.9% of all websites are obsolete is inaccurate. According to this thesis, only 99.29% of websites are obsolete out of an examined 2.4 million.
Zeldman has formally retracted his earlier estimate.
Only 99.29% of Websites Are Obsolete
Ryan Parman is an engineering manager with over 20 years of experience across software development, site reliability engineering, and security. He is the creator of SimplePie and AWS SDK for PHP, patented multifactor-authentication-as-a-service at WePay, defined much of the CI/CD and SRE disciplines at McGraw-Hill Education, and came up with the idea of “serverless, event-driven, responsive functions in the cloud” while at Amazon Web Services in 2010. Ryan's aptly-named blog, Flailing Wildly, is where he writes about ideas longer than 280 characters. Ambivert. Curious. Not a coffee drinker.