Exactly. They need an elevated villain, because you can't base the next two seasons on the Night King and Cersi. They obviously held Euron back for a reason. He's literally been in just three quick scenes. And I sincerely doubt his strategy for taking over Westeros is just centered on his wang and offering it to Dany. A dragonbinder would not only hurt her invasion but also the upcoming war with the Night King. The show needs more drama not less, and definitely not two seasons of Dany running through Westeros like a knife through warm butter.
Having Dany just walk in and take over is boring and kind of ridiculous.