Earlier quoted context omitted.
SSL adds latency, because you're setting up an encrypted connection. Google hates slowing down users, and we don't want to slow down every user unless it's a clear win. That's one reason. When Google switched to AJAX-based search, that temporarily stopped sending referrers, and lots of people screamed bloody murder. For example, http://getclicky.com/blog/150/googles-new-ajax-powered-searc... said "So what can we do a…
Your argument would carry more weight if, the user had the ability to switch to SSL search from the "Classic" search page or if SSL search was a setting that was accessible from "Search Settings" or "Advanced Search" on the "Classic" page. The articles you reference speak to the problems for advertisers and related interests. They do not address issues of web user privacy. Don't get me wrong, Google is in the difficu…
The concern was that people might click into SSL mode, forget they were in SSL mode, and complain because they didn't see Images or Maps or whatever search mode they wanted.
For smaller websites, switching on SSL mode can be pretty easy, but we've still got changes going in to improve various rough edges on SSL search.