In my opinion, demoting a popular veteran TV show to an X:30 PM slot after having been in an X:00 PM slot for many years is one way to relegate said popular veteran TV show. Other examples of such an occurrence:
Two and a Half Men - After having aired on Mondays at 9:00 PM from Seasons 3 to 9, Season 10 aired on Thursdays at 8:30 P.M., following The Big Bang Theory, and Season 11 aired on Thursdays at 9:30 P.M., following The Crazy Ones. Later that same season, the timeslots for TaaHM and TCO were swapped.
The Facts of Life - After having aired on Wednesdays at 9:00 from Seasons 3 to 6, Season 7 aired on Saturdays at 8:30 PM, following Gimme a Break!, and also to provide a lead-in for the new The Golden Girls. The following season, TFoL was moved to Saturdays at 8:00 PM.
"When the run of a network TV show has ended, some go out with a bang, some with a whimper, but all are...Future Endeavored."