Anduin Wrynn x Reader- The Heir

Anduin one of my oldest favourite character from Wow (im nearly died from bloodloss when i see BFA trailer), and this picture (link above) gave me a really good fanfiction idea.
He is young, strong and a high king of the Alliance, but most importantly: he is the last remaining member of the Wrynn family. What happens in Stormwind (and the whole Alli ) if he die without a heir?

Here is the link: https://www.deviantart.com/aimo/art/DA2-Pressure-213898991
All credits for this amazing artist :3