If they go retro, it will be because thats the story Feige wants to tell. And if Feige wants a contemporary story, hell get Reed ir someone else to direct it.
Right, someone else. It sounds like Reed was interested in the Fantastic 4 only as period characters and he lost the job to Tim Story because FOX liked the modern script. If Feige doesn't want to let Peyton Reed tell his story, Reed can stay on the Ant-Man threequel and/or line up other jobs.
Oh, and as far as release schedules, the situation is like this:
February/March, April, May, June, July, August, November, December
3 or 4 Marvel (Spider-Man in July of odd years), 2 Disney live-action (Winnie the Pooh & Mary Poppins Returns this year, Aladdin & Lion King 2019), 1 Pixar, 1 Disney animated, Avatar in Decembers starting in 2020, Star Wars...