Significance of Chev watching the man in the hospital bed?

he doesnt wanna end like this...

the friendly doc of him did asked him whether he wants to be plugged in on few machines two give him at least one day more.
chevy declines that rapidly (scene comes after hospital scene)

its a cool thing thats this amazing "action-movie" keeps you guessing and thinking about those things long time after your out of the cinema.
since the target-group of this movie is more "youngly" the authors found fine
ways to show you the importance of life and engaging you to think about it.

...a better tomorrow

I think he was thinking about the choices he made and the fact that he wouldn't end up in bed as a dying old man.

When there's no more room in hell, The dead will walk the earth...