As a direct competitor? Probably nothing. As a pure store of value. Bitcoin will take it's position as the world reserve currency within 5 years, due to it's trustless design and transparent address viewing make a perfect system for bank transfer.

We'll settle on something else I imagine eventually,... Though things can change! Someone has a good idea I've never thought of.. That's happening a lot recently! So the future is wide open. Short term, BTC and ETH will win the day for the forseeable future.