The big 3 made a conscious decision to get rid of their cars because they constantly had to do incentives to make them sell. Compare and contrast to the Japanese makers who tend to be less likely to do so. IMO they weren't selling as many fits as they wanted, and my gut also tells me the new trade agreement may have had an impact (I will admit I haven't dug into it and checked the foreign content and if it would be out of range.)
Heck, Subaru actually moved their US Impreza production to be domestic. If a few players stick to the car market for a while I feel like they will be rewarded for doing so. Not everyone wants the extra cost of an SUV.