So linking Bitcoin to gold may be a good idea.
You got it backwards. Gold should be linked to bitcoin. I have no use for gold in my day to day life. With bitcoin, I can easily buy anything I need, pizza, cars, computers, etc. With gold, I can hide it in a safe and that's about it. It's not easily divisible. It's not easily transferred. It's generally useless in day to day activities.
I don't understand why it needs to be linked to anything? Can some people really just not get over the fact that not everything needs to be backed by something physical? Cash isn't either but people seem to use that ok. Gold is just not useful as a currency at all. Bitcoin is far better, but if you want to hold something physical buy gold instead.