I remember a part of one of the live streams about gathering storm this year. One of the developers said, maybe it was Dennis shirk, something like: We still have a lot of really good stuff - stay tuned. In this moment i thought - okay, nice there will be another expansion. Another point is the survey they did. They were aware of the problem of release models and costs. What they wanted to know was, what are the wishes of the community and which costs are justifiable. I dont believe they did this survey only for Civ7. May im wrong, but i think there will be a expansion.