With Fallout 4, Bethesda broke a long standing tradition and finally went for a voice acting protagonist in one of their games.
The quality of the voice acting is up for debate, and the dialog system in the game also suffered as a result.
Why not do something like it for The Elder Scrolls 6?
The long and short of it is, fans were not happy with the move- and for future games that Bethesda makes, including the upcoming The Elder Scrolls 6, they would probably rather that the company move back to an unvoiced protagonist, and the classic dialog system.