Yup, I completely agree....
And I feel like at the end of last season with the teaser that Jon Snow might be Rhaegar's son, and therefore Danearys nephew by blood, their union would be in keeping with the old school Targaryens marry within the family thing...
Also, the way that Danny is all about being Queen, and Jon Snow never asked to be King , or even a Lord, makes for a nice character foil...
fingers crossed
Great point about the Targaryens marrying within their own family!
<3