Varine already said what it meant, but to give you some context, it's a line commonly used in "A Song of Fire and Ice", or more commonly known as "Game of Thrones".
I won't spoil the series too much, but the phrase is commonly used as a greeting in Essos, with the traditional response...
You have to eventually break compatibility. If you don't, you'll be supporting legacy code / applications forever, and that is never a good thing.
It would be better for Apple to switch to a different ratio now, rather than 2-3 years from now, when there are even more apps they'll be breaking.
I hope I answered well enough?
Anyway, I feel that the book was most certainly better than the movie, but it was still a pretty good adaption. I dragged a few of my friends to see the movie with me, and got at least two of them interested in reading the books.