Probably Ethereum has the potential to beat bitcoin in market cap, but that not change anything. Never forget bitcoin is a good technology with a good store of value, and have a strong community behind his back.
Ethereum might not ever reach Bitcoins individual coin price simply because there are a lot more Ethers out there (and no set cap) vs BTCs but the overall market cap will be exceeded relativity soon. They are only $8 billion apart and I anticipate that Ethereums market cap will be above Bitcoins.