How do you know?

Thats my guess but how do you know its him thats going to die?

It got released early.

Well he'll be back eventually

I find it hard to care.
 
Now, if the genius had died..... that would have been sweet. And relevant.

Who is the replacement to be? Also, would Thing have died if he was made of rocks, and how does fire not keep burning the bugs?

 Eventually, Johnny will get tired and flame off. When that happens, he's finished. That's probably what happened.    

I really can't wait for Daken to cry at his funeral and run out half way though the ceremony, it will probably trigger Rogue to break down and cry and start running away as well, and even though Daken, and Rogue will have a head start, Northstar will still be the first to the gates of the Cemetery, after its revealed he had a relationship with Johnny too.  
 
Poor Daken, his relationship actually was born on panel and developed the natural way. lol, Mystique really needs to start showing up at places as Johnny Storm, especially to get free drinks. People will just assume Torch got resurrected or something. If Mystique is feeling self critical as well, she could pretend to be Sentry, so people will spit at her as she walks down the street. 

=P