Bitcoin doesn't care, bitcoin will go on without them. They are only hurting themself by stepping out of the world economy.
People will still use bitcoins, the more governments fight against bitcoin the more irrelevant they become.
yep.
I would not be overoptimistic/overenthusiastic. Bitcoin is part of the interconnected economy, so it "care" about the trends in its ecosystem. And the exchange price deviations are the sign of it.