Really? Are you serious?
If bitcoins ever go mainstream, one of my dreams will be accomplished. Bitcoins really deserve to be mainstream, and here's what I think will happen when they become mainstream.
(1) Least usage of fiat currencies-- Fiat? Cash? What's that? This is what people will ask as cash will be seen not at all.
(2) More technologically advanced-- People will get to use digital currencies and certainly people will be using technology more.
(3) Less corruption-- -- Money will be transferred by government to people directly. No ministers to eat in between.