I'm guessing you got that idea from the article on Van Buren on that Nukapedia wiki. It's normally a pretty reliable source, but it's dead wrong on that point. No, the real culprits behind Fallout's temporary demise were the folks at Titus Software, the same geniuses who gave us Superman for the N64.
In any case, though, I didn't say anything about improvements over hypothetical games that we might have gotten instead. By that logic, I could argue that Bethesda's F3 was infinitely better than the Call of Fallout game that EA would have been likely to make. The fact is that the last game in the franchise was that shitty BoS one. So there.