Wait till governments take Bitcoin seriously and start regulate it. This will be a great opportunity for new altcoins designed specially to fit or get around those regulations.
When government attempts to regulate bitcoin, that will be the time to buy. The attempt will do exactly the opposite of what they want.
When .gov bans or over regulates something, its value skyrockets on the open Free market. Look at Alcohol during prohibition in the USA. Drugs right now. That is the beauty of TRUE Freedom - it cannot be quashed permanently.