The more I think about all this, the more I believe RLD
In all seriousness. We've got the failed birthing of Dragons at Summerhall, yes? On the day of Rhaegar's birth. If the ToJ was another birthing of dragons, and we need to parallel that with Drogo's pyre/sacrifice of a baby in order to birth dragons... then Rhaegar tried the blood sacrifice at the ToJ to birth dragons, he would need a "dead" lover and a baby. But Dany lived - born of a dead Lyanna.
I can and have written loads about RLD, but even the show wants the unsullied to see the parallel between Dany and Lyanna. Our first glimpse of Lyanna and she's on a horse. And Dany gets the blue rose in the show.
And the show pushed those strange Rhaegar discussions with Dany last season.
Not saying I'm not on board with the Rhaegar rebirth - but Dany is the child of Rhaegar and Lyanna. I'm almost certain.
Does that then leave Jon as Ned's actual bastard? We've got Arya getting hit for calling him a full brother, but not getting hit for calling him her half brother, which would also earn her a hit if he's indeed her cousin. Then there's Sansa telling Jon he's the son of the true warden of the north and he's got to take back Winterfell.
This would certainly explain Ned's guilts and broken promises, plus highlight a contradiction that I noted somewhere around here about having to make the choice between love/family and honor/duty. If the honorable Eddard Stark chose to bring home and care for his own bastard son instead of his sister's child that he swore to look after, and instead send said child across the narrow sea into exile due to her parentage/looks, that would indeed be a revelation.
Weasel Pie - I should have asked you to revise that dragon's tail ouroboros with the four major conquerors: Targaryen dragon, Martell sun, Lannister lion, and Stark wolf. Is that what is on that astrolabe on the show? I think they skipped the Martells in favor of Baratheon stag.
Having Dany burn the khals on the show is translating the symbolism that Dany herself is a dragon. In the books she had the vision of the khaleesis of the Dosh Kahleen crawling out of a lake shivering. This type of symbolism would be difficult to translate on screen, and I think book readers wouldn't be surprised if Drogon burned some khahls, but if you're trying to set Dany up as the mother of all dragons, the source of dragons if you will, then showing her burning the khals as if she herself were the dragon makes sense in this regard.