Bitcoin indeed grow faster than gold over time, but still who invest on last bull run they hold and wait for a new ATH and no one know for sure when teh next bull run and a new ATH for bitcoin will come. But i agree that this people who say bitcoin will grow a lot should come also on 2018 and say that.
And we are only at 50% of the ATH of that last bull run, they should not feel too worried,,, it is only 1.5 years ago. Even at 3 years they should not worry because Bitcoin will take a long time to get there, but it will. You cannot stop something that is improving every day and making gold and fiat look really bad day by day. Gold will survive longer than Bitcoin, but Bitcoin can always turn into something else!