Anyone else have a hunch that Cersei won't last?

I've just finished watching series four of GOT. It struck me how the already pretty evil and dislikeable Cersei turned even madami evil and dislikeable during the course of the series.
Trying to have Tyrion executed was as low as she's ever been, telling her father the truth about her and Jaime and shattering his illusions was pretty low (if understandable), but calling the mountain back to do combat for her, and then saving his life afterwards was sheer madness.
I think she is over-reaching herself and will the nastiest baddies never survive. There's no way she'll make it the end of series 7 (which I assume will be the final series). Anyone else agree?