Some time ago, my husband and I decided that a perfect Toy Story 4 would be a couple of years from now (2017 would line up well) and that it would follow a real-life path like 3 did. It's 7 years later so Bonnie would be past the toy stage BUT.....Andy would be 25.
Married.
And, the final scene after whatever adventure the Toys were in, would be Bonnie giving the toys to Andy's wife at her baby shower. To come full circle.
That was my storyline anyway!