While the Fox name will continue to exist, it won’t be the same company that it once was, and as a result, it won’t need as many people to do everything the new company will be doing.
While there are benefits to the merger on the content side of things, more consolidation of the Marvel Comics properties’ film rights, and thus an increased value to the Marvel Cinematic Universe, and the ability to add new and exciting franchises to Disney Parks, this is the unfortunate but inevitable downside of there being fewer major film studios in Hollywood.