It's a good idea, because Ethereum is also a good coin to invest. Second largest coin after bitcoin is Ethereum only. Eventhough bitcoin is a leading coin compare to ethereum. But now ethereum has a great chance to move higher. Invest your amount equally in both coins. Each one has high potential and promising coins in the coinmarketcap. Dont completely change to ethereum because in future bitcoin is become priceless coin. So invest in both coins will keep you safe.