When Does Web Stuff Hit the Mainstream

I do consider myself a pretty early adopter of on many levels.  I live and breath technology and feel withdrawals when I get to far away from my laptop/iPhone.  I often wonder though when does a site or a service really hit the mainstream with regards to the average person knowing and using it as part of their online experience.  Of course everyone know Yahoo and Google, etc, and for some odd reason I figured a site likeflickr was getting pretty close.

That was until I came across this article, “Remote Control” on baltimoresun.com.  The “tag” line of the article was the following:

Many are storing and processing data online, a networking trend known as ‘cloud computing’

Then it hit me … there is A LOT of things that are still so far from the mainstream.  A friend of mine and I always try to put a percentage of people like us that are out there and after reading this, it has to be way low.  While we use these tool and services, like flickr, every day, many people are still content to get their pics printed out at the local Wal Mart and stick them in a album

So what are your thoughts?  When do you think a site hits that critical mass and it can be considered mainstream ?