Im just saying they could make the dragonborn into a excellent villian.
Of course they could, but then piss off a lot of people by ruining the character in their mind.
They could, but they shouldn't. Just like they shouldn't make him canonically a goody goody do gooder. It should stay vague.
Open to interpretation. Besides, my money is the next TES game is set another few hundred years in the future, or completely away from Skyrim where word of it is just a passing news blurb.