They have potential to raise, because they obviously cannot fall anymore. A good example is the FREE coin that is boosting from time to time and is worth more than several satoshis, so you can easily make profit from such coins.
It is just a fools errand to dream that those stagnated projects will have a life again, it cannot fall further than one satoshi but it will go beyond that either and you can find many projects like that in the market and once these coins are removed from the few exchanges it is listed, then it will be the end of the road, i am sure those coins will be having zero trading volume and eventually the exchange will delist those coins, before that sell those if not you will be holding those coins forever.