Dispelling the New SSL Myth

Wildcard certificates and subjectAltName are useful if all web sites on a particular IP address are operated by the same entity. But I thought it was a bad practice to share one certificate among multiple unrelated sites, such as hundreds of web sites operated by hundreds of customers of the shared web hosting provider that operates a given server. Go Daddy, for example, has been known to pack upwards of a thousand budget hosting customers onto one IP address and use name-based virtual hosting to distinguish them. And making a site IPv6-only won't work unless the vast majority of users can reach the IPv6 Internet. When will the majority of home users in North America and Western Europe have an IPv6 address?