Be realistic. Its unlikely they will ever take the full fallout game outside of the states. It'd be chucking out all of the lore that they established and creating a brand new franchise at that point. No enclave, no BoS, no deathclaws, no power armor (The American government created it), no vault-tech.
Also, it might annoy a portion of their fan base, or cause legal problems for them. Risk vs reward just isnt there.