I do believe Ethereum will surpass bitcoin soon. From it's marketcap that below 100B I think future looks bright on this coin. Especially when they release their catalysts on January 11. A lot of people is eyeing on this Smart asset class.
It is not easy to surpass the Btc and may take years to make it possible as their is a huge difference between marketcap for both the coins and this would mean it is not that easy as well . But yes ETH has a long way to go and its demand is constantly rising as well which is a good sign.