No serious challenger exists鈥攖he euro has structural cracks, the yuan isn't convertible, and crypto isn't trusted by central banks. Twenty years is way too short to dethrone the dollar.
No. The dollar still has the deepest markets, strongest network effects, and no credible rival ready to replace it at global scale.
You can't replace the dollar without a better alternative, and nobody else has the bond market liquidity to pull it off. The dollar stays king.
No chance the dollar loses reserve status in 20 years. Nothing else offers the liquidity, depth, or trust of US markets.