"With this much setup, they should have some significant role in the endgame"

"The Fan Theory That Makes Game Of Thrones Make Sense"

Alternative guess:

At this rate, wouldn't be surprised if GOT ends with White Walkers triumphant, and Arya having to hide amongst them with another face.

— timpelan (@johnneyred) June 15, 2015

And also:

Are we seriously going to spend the next 10 months on Twitter debating . . . Did . . . and . . . seriously just push a lady to her death and then leap to safety from that same height?

And:

#GAMEOFTHRONES IS RELENTLESSLY REAL AND UNSENTIMENTAL ::magical blonde princess conveniently escapes danger by flying away on pet dragon::

— Saladin Ahmed (@saladinahmed) June 15, 2015

And a thorough summary of the weak writing in the season finale.