In the future, paper money will disappear, it will be replaced by another currency. In other words, paper money will become worthless because many countries print more money to stimulate the economy, the value of paper money will decrease serious. And i think electronic money will be the main currency in the future because it safe, fast and ensure transparency
No big difference. Any physical object that will replace the money will bring the same problems. In the digital money is not for the problem. Paper money will be a very long time.