I got involved with bitcoin in 2010. I never expected it to take off (price-wise) so soon. I thought maybe 2050, and I still think that's a reasonable guess. Overturning the global financial system from the bottom-up takes time.

ARPANet started in 1969. The internet as we know it today didn't take off until the late 90's, and wasn't a profitable world-changing sector until the 00's.