another drawback

Bulk hosting is the main application though, and the people doing bulk hosting already have
some guy with a beard and a hand-modified version of Perl working for them so this isn't so
scary. A lot of them still run Linux 2.4, have their own CVS tree for Apache, that sort of
thing.

This is the right way round to deploy stuff anyway, you only need one server to provide the
service, but you need as many user agents as possible to support it, or it's useless. If in
2008 just one company, say Dreamhost, offer this as a service, but 95% of people with web
browsers have a new enough one that it supports SNI, then you've got something useful. The
opposite way around would be completely worthless.