If you're worried that your investment in ETH may decrease in value, then I highly recommend that you stay away from ICOs. ETH has at least established itself as a valuable crypto, making it a less risky investment than new coins. I can't remember the context, but I thought I saw something in an article the other day about up to 90% of ICOs being frauds/scams. That may have been in a particular country or some other specific setting, but either way, that's a very concerning number. Do you really want to trade in an established crypto for something that may only have a 10% chance of not being a scam?