I don't see any future in altcoins, bitcoin is shown to be the universal currency? Why introduce more coins?
Only one coin is imposible, there are a lot of currency in the world now. Easy.
You now what the Euro did?It simplified a lot in matter of transactions in Europe.
Think of the mess of that will unfold if everyone is going back to their own.
Since I do some traveling , I don't have to care about having lots of change and small banknotes before I get out of France , cause I can spend them in Germany.
Cryptos are far easier to convert than fiat currencies, especially cash.