NBC has a casting problem, but I doubt it is something they are going to change.

In the new series You, Me, and the Apocalypse NBC relies on fan/crowd favorites to carry the show forward. Three of the main leads have previously been on NBC before, Jenna Fisher The Office, Megan Mullally Will and Grace and Rob Lowe Parks and Recreation and The West Wing. 

How is this a problem you may ask?

New television shows are always hard to come by. They either make it big or crash and burn faster than you can say Nielson. It ruthless. But with NBC if they keep casting the same people, audiences are going to grow to expect the same caliber of a show. They’re going to be disappointed in the turnout of a show and have it crash and burn once they decide to no longer watch the show. Skewing preview numbers, but by episode four having lower ratings than expected.