It can be a reasonable idea, I think that now the Ethereum is more promising than Bitcoin and it will be a worthwhile exchange. But I wouldn't do the same, because holding Bitcoin is also good idea. Bitcoin was first and it very important for the human nature. We always remember the first.
in my opinion the etherium will give a stable income with an early prospect, with a minimum of risk. As for Bitcoin, the risks increase in arithmetic progression, but the revenue can be huge.