I think Cutler will be back next year, and it's the right move. His contract is much more team friendly next year. However, they need to start thinking about finding someone to groom. We'll see how they handle it.
Gase has minimized Cutler's mistakes this year. He's turned Cutler into more of a "game manager" as opposed to the "gunslinger" type QB, who takes unwarranted chances downfield, which was his approach in prior years.
While it's true that he has very little to work with at WR and TE (especially at the end of the year) and the O-line is just plain bad, one of his biggest shortcomings is still a lack of pocket awareness. The better QB's have a sixth sense in anticipating the rush. Cutler seems tone deaf in that area. He has more strip sacks and INTs as a result of a lack of pocket awareness than the better QBs. His supporters would blame a sub-standard O-line, but some of those problems fall on Cutler. Gase has reined in his "gunslinger" ways to a certain degree, but he can't teach him pocket awareness. Either QBs have that or they don't. It's one of Cutler's biggest weaknesses, and you saw that again today when his arm was hit twice while he stood in the pocket and threw his second and third INTs of the day, because he just cannot sense the rush closing in on him.