NBC noticed the early success of Friends and decided to re-shuffle its lineup to put that show in the 9:30 PM EST spot, leading to one of the most dominant programming blocs in TV history. The last two episodes aired in June 1995, during the period that was formerly called "Burn-off Theatre", when in the pre-reality TV era networks would make more money airing new episodes of already-doomed shows than it would for repeats from most shows that would return the following fall.
NBC's decision to move Friends to the 9:30 PM EST time slot, and the subsequent success of that show, led to one of the most successful television blocks in history. This was a period when networks would prioritize airing new episodes of canceled shows over reruns.