the only usage is for ICOs and they have been dying or losing their market at the very least as they either get banned or people simply stop trusting them anymore.
as for its supply, it is huge already. we have passed 101 million ether already and there is no max amount to it either. we will see it increase indefinitely.
in my opinion the real value of it is visible on ETC so ETH should also be wort the same or at least near that price which is why $50 was my choice.
what do you think?