Our data being ours is exactly what attracted me to this platform, I just wish I had heard about it sooner. I apparently wasn't reading the right things. I can't think of a better currency to invest in than one based on the value created by the users content.
I don't think Reddit has a chance long term and I think you are spot on about both Reddit and Facebook becoming the next Blockbuster some day.
I too wish I found out sooner but no better time than the present. :)