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How much will the USD be worth in 2030 though? That is the question...

the dollar is destined to collapse for economic reasons and the US debt

Exactly, so that $500,000 will be extremely devalued... whereas were you to compare it to today's value, it would be worth.. say $5000? or less? At which point, I don't think we will be using USD to determine BTC value. I never really pay attention to such articles speculating more than 10 years down the line. It's nice to dream of Bitcoin becoming the mainstream currency, but so many variables can skew these predictions.