NO they are not considered goners. I have had the same problem but on a smaller scale. I transplanted some small robellinis into one gallon pots and they seemed to be ok for about two weeks then it looked like they were dying. After three weeks it appeared that there was no hope, leaves were withering away and what not. I still continued to water and a week and a half later I saw a brand new leaf starting to emerge about a half of centimeter. Something that might help alot is a fungi called mycorrhizal fungi, this fungi coexist with plants in nature, colonizing the root systems to the soil, you are giving your robellinis a can of spinach. It also extends the root area, up to 1000% helping it survive under conditions of stress. So dont give up, Regular watering will also help. Hope everything works out.
Jason