Welcome to the bitcoin world.
You see going back to $420 price is impossible? What if I told you that even below $400 has a high possibility to happen "right now"?
Please keep in mind that $50 price increase or decreased considered as a light margin to break it or to surpass it.
Going back to $420 could happen. If there is a big bad news about the bitcoin, it can go below $400 and stay there.
I cannot imagine any bad news. The bitcoin shall not be banned in any country, it is a legal property.
i think that the price will not fall to 420 any more and the price is going to grow only from now because a lot of people are investing in bitcoins in order to make some money
If most civilized world declare the bitcoin legal, it will be legal gradually in many countries. Every country will use it.