Hard to say anything about altcoins in general.

The amount of coins makes a large difference, and the rate at which they produce.    

An altcoin like DogeCoin would never be worth $600 because there are way too many dogecoins and they get created too fast. But something like Ether could be worth more per coin because there aren't that many Ether I believe.

And bitcoin most likely will see $6000 pretty soon, probably at or before 2017