Yes, many people have theorized that the menace from the Others will be what brings Dany and her dragons to Westeros.
Probably Melisandre, with her religious mumbo-jumbo, thinks she can rid the Others from the North but it won't work. This will be possibly where Stannis meets his doom because he has got a touch of megalomania himself.
BTW, I wonder if it is true that Dragonstone Island has been sacked? If so, Davos, Stannis wife and little girl have been killed.
Even more reason for Stannis to not give a damn anymore and throw all caution to the winds, I guess. I guess that answer will be in Dances with Dragons, too.
I know its totally pointless but I have more cast wish list.
Prince Doran Martell---Ghassan Massoud
Arrianne Martell---Aishwarya Rai
Prince Oberyn(the Red Viper)---Alexander Siddiq
Ellaria Sand---Eva Green
(I get the impression that the Dornish people are Arabic or Indian in appearance and culture. But, thats just my opinion.)
Oberyns 8 daughters--the "Sand Snakes"
Then, there are the 4 little girls.
WTF are they called Snakes? I understand the "Sand", but Snakes?
Sir Aerys Oakheart---Craig Parker
Khal Drogo---Rudy Youngblood
Edmure Tully---Eric Stolz
Lord Hooster Tully---Bruce Spence
Blackfish Tully---Jeremy Irons
Vargo Hoat--Vincent D'Onofrio
Aurane Waters---Hugh Laurie
Mace Tyrell---David Thewlis
Queen Margery--Summer Glau
Cercei--Nathalie Cox or Katheryn Morris
Sheylse Bartheon--Linda Hamilton
Stannis---Martin Csokas or Colm Feore
Catelyn--Gillian Anderson or Lena Headey
Ned--Colin Firth or Noah Wylie
Illyn Payne(the Executioner)---Lance Hendrickson
I'll think of more later.......
On the ASOIAF Board there are actually little "flame wars" over these casting notions.
Which is really funny because it has already been announced that most of the actors will be from UK, and unknown. But, to hell with it! Its fun, anyway.