Prediction:

Abby is riding her bike then stumbles upon the abandond New and Improved Freddy Fazbear's Pizzeria.

She doesnt tell Mike about the pizzeria and starts exploring, once she leaves she left the door open then the Animatronics get life and exit the Pizzeria.

The Animatronics want revenge so they start a killing rampange.

Vannesa survives the stab and gets PTSD of William Afton.

Vannesa,Mike and Abby defeat the Animatronics and 10-15 people die in the process.

In the Post Credit Scene we see Springtrap/William Afton wake up in a new building, Fazbear Frights...