Hmm, I wonder about WXYZ with its News at 7 and Entertainment Tonight at 7:30
Detroit I think is a special case in the Scripps chain; it's a three-station news town and there are people who still think WXYZ is owned by ABC. There seems to be a heavy amount of local control at WXYZ and management that knows it can't break the station with whatever idea corporate has come up with to cheap out. ET also has a declining audience, so it probably will draw a lower cost with the loss of Mary and Mark and stations having to tolerate that TMZ now has all the good stories ET claimed for their own.
The 7pm news isn't going anywhere; both WXYZ and WDIV have been neck and neck for years and you're not going to see a flagship station cede any ground to their competitor.
