Basically, that video showed some events in FNaF 4 that can theoretically happen

One was that in night 1, 6, and Nightmare mode, Bonnie and Chica could just stay in the living room forever, and in the YouTuber's words

"They must be watching Netflix."

So my brain immediately thought this

Nightmare Bonnie: Okay, I'll go left, you go right.

Nightmare Chica: Okay- *notices the TV has Netflix* WAIT! THEY GOT NETFLIX!

Bonne: hold up, screw the child, let's watch a movie!

*Eventually, Nightmare Foxy and Nightmare Freddy realize Bonnie and Chica haven't tried to attack, so they went to see what they were doing, and caught them watching the 3rd Sonic movie*

Nightmare Freddy: Uhh, what are you doing?

Nightmare Chica: They got Netflix, so we're watching a movie

Nightmare Bonnie: Wanna join us?

Nightmare Foxy: Fuck yeah, I'm gonna grab the others

*Eventually, the child realized no one was coming, and went to the living room, only to see Nightmare Freddy, Nightmare Bonnie, Nightmare Chica, Nightmare Foxy, Nightmare Fredbear, Nightmare, Plushtrap, Jack-O-Bonnie, Jack-O-Chica, Nightmare Mangle, Nightmare BB and Nightmarionne watching the 3rd Sonic movie*

Crying Child: Uhhhh...

*Everyone turns to him*

Nightmare Fredbear: ...

Nightmare: ...

Nightmarionne: ...wanna join us?

*The child nods and watched the movie with them*

I basically just made FNaF 4 good ending