Good Movie, but.....Needs a Better Ending.....

Rating: 8/10 (8 January 2018)

*****Spoilers****
A much better ending to 3 Billboards.... in the last scene as Frances McDormand and Sam Rockwell were driving out of town they started talking about whether it was a good idea to go all the way to Idaho.... and then it just ended. Everyone in the theater was like.... HUH?!
What they could have done is have Jason Dixon (Rockwell) say, "We could go on or we could stay here and continue to work on this together"..... and then you see a camera shot (from above) of the car coming to a stop.... and then the camera pans over, fades out, and then fades in on the 3 Billboards.... which say in order:
1. "We're coming for you"..... with a picture of the mom, Mildred Hayes (McDormand), and
2. 2nd billboard has pic of Jason Dixon, with words under his name of "Private Investigator", and
3. 3rd billboard has pic of Woody Harrelson, with his name of Sheriff Willoughby.... and msg, "We will find you".
So Mildred completely goes 180 on the Sheriff because he gave her the $5000, and honors him by including him on the 3rd billboard. The message is ....He's on our team.... in spirit.... and we will find you.
This is an ACCEPTABLE way to end the film if you're actually not going to find the killer. If I can think of this why the heck couldn't the producers, writer, or director think of this?!