If the coin no longer gives profit. People would prefer other coins to make a profit. And this is just like on Ethereum, this coin is experiencing very slow developments. Even now the resale value is declining and people are bored to wait longer.
Yes, I realize if not everyone like that and still many people believe in Ethereum. I personally still believe and long term investments with buying Ethereum, I suppose in the future will be profitable.
I see no reason to doubt the survivability of ethereum. In my opinion, this coin will be in demand for a long time. Now the ethereum network is really overloaded. This is primarily caused by the appearance of a stable USDT coin in it. After further improvements, the scalability of this coin should increase to several tens of thousands of transactions per second. After that, and look at the demand for this coin.
I believe that Ethereum will be in demand not just for long. This coin has a good chance of replacing Bitcoin as a means of payment.