Millions of Americans were duped by the federal government and the Federal Reserve into buying homes they could not afford and failed to count the cost. When the financial crisis of 2008 hit, they could not keep up the monthly mortgage payments and defaulted.
Bitcoin is not an actual physical coin, and if computers are shut down, you can't buy or sell them. That's why nothing will ever replace gold and silver coins themselves, and all investors should have them at home or in a safe deposit box.