Ethereum has quickly taken up nearly 40% of the transactions in the cryptocurrency market. ETH may surpass Bitcoin as the preferred crypto-currency. The "flippening" is expected to come soon enough.
So let us do a bit of analysis on why this is happening. It is simply because of mining.
Bitcoin mining is very hard.
Although Ethereum still is beyond the reach of normal PC users, the ability to create cryptotokens that are linked to the ETH, means many multiples of new coins within the ETH world can be created without any mining at all! When these tokens are traded with ETH as a reserve, it increases the demand for ETH. Which increases the price for ETH.
So ETH is likely to overtake BTC simply because of the ability to spawn new currencies. Go forth and multiply!