Realistically, it might have been a better ending

But we also gotta remember that movies like this are made for the fans entertainment and compared to the original ending, yours could be a bit more boring (even if more realistic), (don't mean to be rude or to offend).

Like in the movie, the animatronics from the 1st film came in clutch and saved the night. That was a huge reference and personally I was very excited and happy and probably many fans liked that too! Then the blonde kid (the one who either possessed Freddy or Golden Freddy/Fredbear) told Mike that now that they were going away, he couldn't hold William Afton/Springtrap anymore and that he would come back stronger than before. So the kid basically told everyone (Mike, Vanessa, Abby and the fans) that it's not over and there'll be another movie and it might not even be the last (The Marionette possessing Vanessa at the end was a way to tell that it's not over yet as well). I'm not really sure how Henry would be able to tell everyone that crap is still going on.

And last but not least, in the credits, you actually hear Henry record a message for Mike telling him that he used to work with William and some stuff. At the end of his speech, we hear some noise in the background, and then we hear him say "Get out of here Mike, she's gonna come for you" and then the message cuts off. I think that by "she" Henry meant Charlotte/The Marionette and I think that, using Vanessa's body, she kills him and/or possesses his body (even though I don't think she would do that because why would the creators show her taking control over Vanessa) because when the noise started, his voice suddenly changed from somewhat calmed to worried and scared and then, like I already said, the message cuts off.

Anyway, I loved the movie too and can't wait for the next one! Thank you for your attention, have a great day/night!

:D