It is not a problem to change the size of a main cast. But this show has 8 main cast members, but needs to increase into 12 in order to gain some more ratings and reviews at the same time, even if it is improving well.

I think Peter will change his mind to stay put and both Betsy and Abby might change their mind to return to this show by after New Year's 2015.

Actually, no need for Abby, but we can accept more of Lauren, played by Tracey Wingfield. So cranky old actress Jenny O'Hara plays Dot, I didn't know that!

Since this show is trying to improve well, there might be a chance we should increase this show's main cast from 8 to 12 members, and of course, nothing beyond 12. Not only we need some more ratings of this show, but we need to strengthen this show's interaction rather than going too fast exploring in order to make this show more interesting properly to increase ratings more.

Zoe is probably too strongly talented to be let go from this show due to her style as a romantic comedy type. Adam might change his mind to stayput.

I prefer to proposed this type of main cast sometime in early 2015:

Mindy Kaling as Mindy Lahiri
Chris Messina as Danny Castellano
Ed Weeks as Jeremy Reed
Ike Bariholtz as Morgan Tookers
Adam Pally as Peter Prentice
Zoe Jarman as Betsy Putch
Beth Grant as Beverly
Xosha Roquemore as Tamra
Rhea Perlman as Annette
Neicy Nash as Jean
Tracey Wingfield as Lauren
Jenny O'Hara as Dot