I did get a grin at that line.
Actually, I had to check myself for preconceived ideas.
Since Cersei and Arya are such pivotal characters, I subconsciously doubted either would die this season. I imagined some weird, time-sucking event would sideline Arya's ability to assassinate Cersei. But, maybe it is Cersei's time. (Or Arya's)
The seven kingdoms are practically united in their hatred of Cersei, so her future doesn't seem too cool--and think about the huge geoshift, the powerful alliances can form in her...*ahem* absence. Jaime, nay Tyrian could ascend the Iron Throne.
I haven't read the books, and I've been told by those who have that basic plot elements in the series diverged from the novels quite a while ago.
Makes watching much more fun, I think. Mystery.