I have to say that the final episode this season really advanced the story line very nicely and did a great set up for next season .. I am a little more convinced that Benioff and Weiss, with help from GRRM, can, in fact, finish it off in 2 more seasons .. considering the amazing amount of filler in books 4 and 5 and the obvious ability to edit and condense ..
For any that may have missed it, I'm reposting the link I provided a few months back on the excerpt from "The Winds of Winter" that GRRM posted just prior to the 4th Season HBO premier ..
I'm also reposting another bit ..
In the book, "Dangerous Women" an anthology co-edited by GRRM .. there is a Martin story
set during the Targaryen Civil War .. 170 years before "Thrones" begins .. and the Targaryen family equals or exceeds the Lannisters in all areas ..
In that story, the incest and polygamy of the Targaryen family line is gone into .. and would hint at the Targaryen bloodline being much more widespread than what we think from Books 1-5 .. the riding of the Dragon itself is limited to one human rider until the human dies .. IOW, the Dragon will only accept one rider .. and the Dragon / Human Rider relationship is very much the same as the Stark / Direwolf relationship .. a warging ..
However, GRRM never, to my memory, says no one but a Valyrian or a Targaryen can ride a Dragon .. he does make it appear that you must be able to bond with the Dragon .. and we saw that with Dany in the past as she was drawn to the eggs from the get go and nurtured all three after the hatching ..
We're at the point where Dany has obviously bonded with Drogon, thus, if the One Rider / One Dragon holds true, Viserion and Rhaegal are still free agents ..
And who is to say that Aerys might have invoked first rights to Joanna, Tywin's new wife back at King's Landing .. thus spawning Tyrion .. ?? Is that why Tywin retired as Hand .. ?? And if so, does Tyrion have Dragon Blood .. ??
Rhaenyra Targaryen .. who is married to her uncle .. also has a child with the same type of deformities that Khaleesi Dany's baby had ..
Lastly, the Riders back then had saddles, whips and chains when they rode ..
.............. as a follow up to the above, I believe we can safely say we have our first Dragon Rider on the show .. Brandon Stark .. when Bran and Company entered the Cave of the Three Eyed Raven, (which, BTW, does not happen in the books until Book 5) .. the Greenseer says something to the effect of "You will never walk again, but you will fly .. " .. thus, I am claiming Bran as the first reveal of a Dragon Rider ..