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I'm sure an ounce of Gold will be worth $5k in the future. Same as how 1 BTC will be worth $1m in the long run.
You haven't said anything new, because some people have been saying that for a very long time, and yet look at what the price of gold was 15 years ago (just over $1000 per ounce) to today it's only $2700 per ounce - there's nothing impressive about that if you take into account inflation over that same period.
Buying Gold now would be the best decision to make. Assuming, prices don't go down any further. By having both BTC and Gold in your portfolio, you can achieve true peace of mind. I'll be paying close attention to the market, just in case. 
Why? In 10 years the price may be $5000 (or not), but realistically inflation will again take most of the profit. Compared to BTC, gold is a much worse choice because it exists in very large quantities and it is difficult to say exactly how much - while on the other hand we have the exact number of BTC that will ever exist with a clearly defined protocol according to which it will come into circulation.
Don't get me wrong, it's good to have some gold on the side as insurance in case something bad happens globally with the internet - because without the internet, BTC would very quickly become worthless.