Don't sell. Diversify and get both (like I have). People might laugh at bitcoin, but it is a very important and serious innovation. Especially when the western central banks are talking about eliminating cash and imposing negative interest rates, bitcoin is an arrow in your financial quiver against the fiat currency statists.
However, Like I said earlier, significant position in electronic currency is very dangerous, as with no sovereign tying benchmark, a rapid decline would not be hard to envision. Hedging it as a guard against negative interest rates is highly not recommened.
Are you ever worried you can lose your Bitcoins?