If we exclude F3 I would like after the Fallout2 when the old big threat has been erased and new ones can rise up ^^
The only thing that would be needed is to do a little research
You take up a discussion on how people ended the game and then form it after that poll.
Like how many got these endings, like if the majority got the ending where Modoc became prosperous, then you could have a prosperous Modoc in V13.
Or the majority helped Gecko and got the movie when Vault city waged war on Gecko etc, im sure you get it.
If there where to be after F2 timeline and if V13 occurs in the area of the old games I would like to see something like this.