in mid January 2018 ethereum was in the range of $ 1,377 and that was the highest achievement of ethereum prices in 2018. and in 2019 ethereum there was no significant change, at this time ethereum was still stable with prices fixed or in the range of $ 190.
if the ethereum price decline continues, it looks like the tokens generated from the ethereum platform will not have high selling points and most likely the project developers will also no longer use ethereum's platform. isn't the end like that?
You should consider the market is not controlled by a single entity it is free for all market it means that everyone is owning ETH.
Now, do you think that these hodlers will agree or buy those tokens that someone had dumped in the market?
It is an open market and i don't there is no chance that the value of ETH would go down continuously.