I used to think no one person or group of people was slower at getting anything done than the US Federal Government.
Bethesda has them beat by a long shot. Is game development really that hard, tedious, and time consuming?
We are not talking about making a new game from scratch. So much is already there. What the land looks like, the people, weapons, armor.
So you need a new story with many main and sub quest. WAM BAM you have ES6 it would be that easy and everyone would buy it.
Fallout 4 did not look better than Fallout 3 to me. Infact, I preferred the old look.
Better game mechanics was the only thing I liked about FO4.
IMO Bethesda is way over thinking this and losing millions of dollars.