Yes, the price of ETH's marketcap will go over that of bitcoins very soon(possibly even today or this week).
The price has been surging and for a good reason. ETH has an upgrade in their code coming out within the next few weeks. The price is going up now because people are pricing in the expectation of ETH releasing their new version soon.
When the new version is released it will likely go even higher. There is also another version upgrade to be released sometime in 2018. Their roadmap is clear and more precise, vs bitcoin who has a bunch of Jihan Wu drama.
Precise roadmap - centralization, anyway, I do think that ETH with its huge supply and another supply through its coming PoS will definitely surpass bitcoin in terms of Marketcap, which can give an illusion that ETH is more valuable and being number 1 to a new person in cryptocurrency which in fact we all agree that this coinmarket cap offers nothing other than estimated price of total coins.