According to my research, the future of money is quite straightforward.
In the future, money will be completely electronic. Paper money will barely exist.
The experiment of the electronic money is already working today.
Plus, I am of the opinion that the best solution for money is to allow the circulation of only 4 or 5 currencies in the wh*** world. This will certainly help the world's economy, by making sure that less and less economic crisis occur.