No Mutants Allowed

Will there be a mod someday that redeems it?

Nope. All its major issues are at the core of the game, no mods will fix the shite story, the terrible quests and horrid writting.

Will Fallout 4: Vault 13 ever come out? Will it be worth to have F4 in order to try Fallout: London?

I know Fallout 4: New Vegas is dead. But are there other projects that will reach completion?