I absolutely agree that the dragons will be more prominent as the story goes forward in this and future seasons. No clue what will happen - which is a great thing. Love that it could go in so many directions. I don't believe all 3 dragons will make it, one, two, or even all 3 could be gradually killed off...but they will play a huge role. I do think Tyrion gets it in the end, and I do think someone with Stark blood will win the game of thrones. How it happens, and which of the 5 remaining in the bloodline (Jon, Sansa, Arya, Bran, and Rickon) wins...no clue. It really could go in any number of places. I could picture Bran flying a dragon. He has the whole Warg and Greensight thing going on. Could you envision him getting into the head of a Dragon?? The Possibilities are endless!!
Let's not forget, there was also a little hint that Caitlin Stark may not be completely dead, so she could still play a role (hope not) - I sound like Miracle Max from The Princess Bride..."It just so happens that your friend here is only mostly dead. There's a big difference between mostly dead and all dead. Mostly dead is slightly alive....have fun storming the castle..." - read it with a older, NYer, nebishy accent).
There's also Benjen Startk, Ned's brother who took the Night's Watch and is "missing" north of the wall in the first season/book. Could he resurface (don't remmeber if they killed him off in the shows 1st couple seasons or not. Don't think so..I missed it if they did).