In 10 years, knowledge about Bitcoin will be mainstream.
But will enough people have adapted to this mainstream by then?
All I'm hoping for is that the "knowledge about Bitcoin" will be legit information, and not the reputation and knowledge masses currently have about BTC thanks to the MSM staining it constantly. If we're only 10 years from mainstream knowledge, then things are going to go insanely well. One thing I don't think will happen is your second question tho. Laziness is too much of a trend today to care about learning how Bitcoin works and how to protect yourself from Surveillance States desperately attempting to invade your privacy.
Once it has become mainstream, a group of countries - or even the IMF itself - could regulate all access to Bitcoin. Tracking coins and banning the sale of coins for fiat by exchanges if they come from certain regions ( exchanges, wallet suppliers). Illegalization of the exchange of Fiat for Bitcoin, with the regulation again targeting exchanges as entry points.
This regulates Bitcoin itself.
There is never going to be regulation under Bitcoin's network, so you could basically transact at any given time even if it's illegal in your country -
under your own risk, obviously. One thing I'm particularly afraid of is that unknown addresses will be flagged and as soon as the link of unknown coin owners get their identity exposed, they'll be questioned for everything they've done over the network with harsh penalties.
Something like - your coins come from a source unknown to authorities?
You're suspicious. To some, it may sound like dictatorship or something not so far from Orwell's vision. I personally think it's just a few steps away from reality. We're already living in a Surveillance State - the BTC and criminal activity will be a continuous excuse that'll never end until they get their plan to succeed.
How can we defend Bitcoin against it?
I don't think so. The only thing I can think of is providing Bitcoin privacy-focused updates - but I am afraid this will push it into bans and rejection. This is double-edged: while it lets us, "the Internet Rebels", continue Satoshi's vision of a decentralized mean of exchange, Bitcoin would go into the underground markets in those countries where it'd get banned - increasing the illegal usage substantially.
We're quite close to the hard regulation of cryptocurrencies. Let's just hope it's going to be a
fair regulation, and not something worse than the KYC nightmare.