He’s not a baby anymore!
The true Dark Iron and Bronzebeard heir, and the to-be ruler of Ironforge, he’s a kid now- older than Anduin’s original age back in Vanilla, he’s a young teenager, since Anduin is a full-grown adult.
Time has passed, and they need to update the story involving the dwarves uniting under Ironforge- you can even customize your regular dwarf and make it look like a Wildhammer now, so, canonically, all the dwarves are working together once again, under the Alliance banner.
As cool as Moira is, I think she’s succeeded in her role as a mother and regent lord, and Dagran is now old enough to finally sit on the throne.
The wiki even confirms this fact:
"In ‘Before the Storm’, he is a young child with skin described as an unusual but warm shade of gray. His eyes are large and green with no hint of any red glow, and his hair is white. "
“In ‘The Vow Eternal’, now several years older, he is described as having a glimmer of fiery red in his green eyes and his white hair being tied into a tidy braid. His body is described as gawky.”
“Because Moira was with child when Emperor Dagran was killed in Year 25, Dagran is about 14 - 15 years old in Dragonflight, which is in Year 40.”
Another interesting tidbit, is that he’s got less of a dwarven accent because he spends most of his time reading books.
TLDR -
Moira’s son is older now than Anduin was in Classic, and Anduin still managed to be king.
I think it’s time to put Dagran Thaurissan II on the Ironforge throne, with a proper unique model. Update the lore!
Would also be cool to see Moira raising him better than Magni raised her (he wanted a son, and made that very clear.)