A while ago (2017) there was this Dutch family that sold all their assets for BTC and is now traveling around the world. He had around 500k USD worth of BTC and expects it will at least make 5x in the next 3 years. In the meanwhile, they are living modestly and using 20% of their cryptos to trade.
Would you dare to do the same? Sell all your FIAT for CRYPTO?
I would not have the guts to invest everything i have into crypto. As long as the world revolves around fiat it is better to have a safety net rather than worrying that the market will fluctuate and loose everything.