If the scenario will become true no one can buy ethereum and interest to invest, because there's have a lot of potential came from the flatform have an potential to improve like xrp. But this only a drama do not worry ethereum are in the strong even if their price is in the lower value wait for another increase of ethereum if the bitcoin price is goes into bullrun.
Every decline in Bitcoin and ETH corresponds in some high or ups in the future. They maybe declining now but knowing their uses and capabilities will just make us think of buying it more in their declining prices. Ethereum is still use in many transactions as well a great platform to start every project with, it's just if we lose our hope now after it didn't move quite a lot this year or sell it in these price is still our choice. It will depends in our personal situation now if we need our money badly to sell ETH now.