The Toy Story franchise isn’t the only Pixar franchise to follow this pattern of having about a decade between their movies.
While most people expected Toy Story 3 to be the end of the series, Toy Story 4 proved this wrong, and also proved why more Toy Story movies work.
The first two Toy Story movies only released about 4 years apart, with the original plan being for Toy Story 2 to only be a straight-to-home release like most Disney sequels at the time.
However, if we do get another Toy Story movie, it probably won’t be for another ten years.