If you haven't heard, Ethereum has gone up 20% within the last day and has had higher trading volume then bitcoin. Within the next day or two, it is very possible that bitcoin could lose it's number one spot.
One reason for the price increase in Ethereum is Okcoin, one of the worlds biggest exchanges, is now adding Ethereum to be traded. This could be that Ethereum gets dangerously close to Bitcoin's market cap. My guess is if they get within 5 billion, bitcoin users are going to start selling bitcoin and hop to Ethereum.
Now, looking in the future, Japan has implemented 100,000+ bitcoin payment systems and is looking to be 400,000+ in the near future. Because of this, Bitcoin and Ethereum are going to be close competitors for the number one spot.
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