I don't see any mass use yet.
A lot of people know about Bitcoin now but are not investing.
Not critical mass of use yet- but critical mass in the media. EVERYBODY is talking about.
Every newspaper, every TV station that talks about economy, every magazine, blog.. you name it
Even my 80 yr old father asked me to explain what it is.
( he read about it in Time Magazine in the article about the darknet)
We just need the development of hardware/software to catch up and make it EASY to use and keep safely.