There is no way that Bitcoin investors are going to switch over to gold

I can tell you that even without reading the piece you linked to. I can even go so far as to claim that it is a complete junk. Why am I so sure? The reason is surprisingly simple. Because Bitcoin and gold are assets which are on the opposite ends of the investment landscape (with many other asset classes in between). People invest in gold if they want to save the wealth they have already accumulated, while people who invest in Bitcoin are speculators and looking to multiply that wealth or create it in the first place. So it is two entirely different groups of people with completely different goals in mind, and there is not a single chance for the massive switch-over between them. It simply doesn't happen in real life