Gold is a safe and easy option. That's why general population would rather choose gold. Bitcoin has far more potential but way more risky.
At least it's exchangeable at will. Try doing the same with physical gold.
For many people this is a huge problem. If you don't live in a big city you may find yourself in a bit of a problem when you have to travel to be able to sell your gold. You won't even be able to visit the dealer just like that because most of them don't hold so much cash so you have to set up a meeting, then go there with your gold and go back home with cash or wait for them to send money to your bank.
With bitcoin it can be as easy as 15 min to sent coins via a bitcoin ATM and hold cash in your hand.