4. Chicago Bears
To put it plainly, Matt Eberflus is an overmatched head coach who is not ideal for cultivating a rebuild. If the Bears "progress" to four or five wins this season, it will be hard to justify keeping him for a third season. It might happen-it will just be hard to justify it happening.
Chicago is also in line to have two top-5 (at worst top-10?) picks in next April's draft (thank you, Carolina Panthers), and taking a quarterback with one of them will practically be an order unless Justin Fields looks like a stud from here on out this season. Finding a head coach who can develop a quarterback and foster a good offense will be a priority with having a young quarterback in mind. And that young quarterback could still end up being Fields.
We frankly don't know what Johnson would do with a young quarterback as a coordinator and play caller. He and Goff have cultivated a great relationship though, as for his part Johnson has had the clear (though hardly revolutionary) intention of leaning into what his quarterback does best. As a head coach, regardless of what side of the ball your background is on, you'd better cultivate a good relationship with the quarterback. Johnson will easily transfer that to being a head coach, whenever he becomes one.
It would be hard to see Johnson leave the Lions to take a head coaching job with a division rival. But the opportunity may be there with the Bears, and in a certain light it could be an appealing opening if available.