Kinda big rock records out right now(depending on what you call rock the genre is vast now thanks to the tools available and variations in sound). For a while, the genre was being overlooked, but lately, i've noticed a comeback. Imagine Dragons, Bastille, One Republic, American Authors, tons of others are running charts right now.
There is a limit to how many good ideas can be had in any genre without it repeating itself, and there are other, newer, genres which are developing faster.
It has had a little bit of a revival recently, probably because pop music is a bit rubbish atm and that drives people away from the mainstream artists. Also because all the money in the music industry atm is made in concerts and rock bands are generally good live.
I don't think is dead neither I think it will die, but mostly because of the people enjoying the music and producing it on their own. I think that comercially is pretty much dead if you compare it against newer genre, nevertheless I don't think it's ever going to die.