Yeah Toy Story 3 truly gave enough for each character by having it become a group escape movie.

I don't know what the reason for a 5th sequel would be. All of the Toy Story short films since Toy Story 3 have basically been what Toy Story 4 turned into.

I'd be interested in a prequel that followed Woody. Since he's a toy from the 50s/60s era, he clearly had a whole other life without Andy. Set him in a story with vintage toys of the time. I could see that working.