i'll concede that it did feel like a glorified tech demo and a testbed for further developments, but i don't have high hopes for a decent sequel, much less a fully fleshed out one. one can only speculate but i could see some more content being added, even if it's only a major update/DLC.
and to be honest, there's plenty of stuff to develop on story-wise. what happened after the dominator, on both endings? was the earth exodus successful? what did they find?
and so on. while being a weak incentive for a sequel, considering the story was barebones, i can see a lot of stuff being delved upon.