Alt coins havent even had their heyday yet.
Imagine a large exchange where each coin can be directly traded for any fiat currency in the world.
Right now most coins are traded at an unfair disadvantage compared to bigger coins like BTC and ETH, because not only do you have to (usually) first buy those currencies, once you buy your alt coin, you are forced to place its value against BTC or ETH.
EVERY coin should be traded against your chosen fiat currency.
And were not even there yet. Thats when the real fun begins.