No, it is not. Btc gold will be like the other coins which always increase and decrease, and it follows with bitcoin. I don't think that there is a safe currency because the cryptocurrency investment will have the risk which we need to accept. If you can understand the risk, then you can choose any coins at the market and hold it. But if I were you, I will invest in bitcoin only in a long time and don't invest in the altcoin for a long time because the price will be down deeper if bitcoin is down.