From your average movie goer, probably. But a lot of marketing for these movies is done by fans anymore, and I don't think fans, who are the people that did watch it, will spread the word the same way they will about a Doctor Strange or a Thor. I think the Inhumans are just not very popular and are very niche from a conceptual stand point. Unless you tie them to something people care more about, like a future FF project or another Avenger or something, I see an Inhumans movie failing to do better than Eternals or Shang-Chi. With the added disadvantage of being possibly more expensive to do