I think there's every reason to think Dany will make it to the end as well.
Tyrion is Martin's stand-in. There's no way he's dying.
[sblock]I also happen to think that his knowledge is going to be instrumental in using the dragons (like saddles and whatever dragon-y abilities they have) against the Others. More than any other character in the books I want Tyrion to get a happy ending (*snicker*) as in married to a woman who loves him.[/sblock]