There is no way everyone will has own currency.
This is probably true in my opinion. While the market will develop in the future, I think there will be just a few winners and so not so many cryptocurrencies...
If the supply is high we can see a cheaper price and it will be more like a fiat money. Bitcoin should still be the leader so we can have a better prices, every economy have their own fiat money now and it looks like a normal money, crytocurrency will tell a different story so lets hope for the top coins to improve better.