I'm not spreading FUD and everyone is free to do whatever he wants. After all, it's your money.
What I'm suggesting here is to take all the tokens and coins you're holding and start reading the whitepaper, check the roadmap, see the team behind that project and how active the developers are is by looking at the GitHub repository. If it's not looking that good, don't think twice, just go and sell regardless of initial buy price because you'll be cutting your losses this way.
I understand that saying "hodl" is nice etc but you should use your brain and don't be blinded by the idea that every useless out there will go to the moon. Only a few are worth investing in so instead of holding random coins, you may want to target something that has been here for a long time and still doing well such as ETH, BTC.
I respect the idea of giving the advice to the holders about this scenario, but i would also take some part of the advice, hence, it really helps to cut the losses that might be happen in the future, i believe that studying again the token background is a good idea whether we need to sell that specific token or coins, because it is not new to our knowledge that some developers would abandon their projects, and make another ICO or tokens again. The idea is simple, we need to be careful of what coins or tokens we need to be hold and sell, some others out there are useless nowadays, making the investors or holders loss their fate in investing new ICO or tokens.