I don't really think it would work out. Given that Bethesda doesn't like to establish canon and they have a habbit of saying one thing and then later changing their minds or at least some devs do after the fact. As in the game says one thing multiple times and months after the game one of the devs in an interview says something that completely contradicts everything the game has to say about that issue and it starts a war amongst the fans of who is right the game or the devs.
I can see that happening with any attempt at a New Fallout Bible. BTW the old Fallout bible has that problem as well. The games say one thing and the Bible says another, so this isn't my way of saying "Bethesda isn't "capable enough to do it." Chris Avellone made mistakes with his bible, that is why he updated it many times and it had mistakes that contradicted the games.
The thing about the original Fallout Bible itself is that it was updated many times, added new information, corrected information and so on.. So if they were to do it, they would have to be willing to keep working on it as the series grows and if they make mistakes, I would hope they fix them.
But as I said when the orginal Bible made mistakes the way to "fix them" was to say "the game is wrong." And I hate that. I really do. The games should be the main source of info, not something after the fact. A New Bible like the old Bible should just be to fill in information that the games themselves don't address or only give limited information and should not contradict the games itself but confirm what the games say.
I would hope they added info on Fallout Tactics as well.
Anyways, I have mixed feelings on the idea of a New Fallout Bible based on what I just said. In many ways I would want one and in many ways I don't want one and just leave the games to explain things.