Knowing their history... Incest, incest and more incest . And dragons (and their death as we know no dragons survived) of course.
As if they would let go of the serie. They're going to milk this until they can't. They rushed the end of the main serie because of D&D who wanted to leave the ship but it doesn't mean HBO was at all, they got too used to the impact and money GoT gave them.
To be honest Targyarens and their superiority complex due to their blood and connection to dragons always annoyed me to no end so no thank you !