I'd rank all the major players as such, in regards to their status at the end of Endgame...
LIKELY WON'T DIE:
(In order of most likely to live to least likely to live)
01 - Black Panther - Too much money left to make.
02 - Captain Marvel - Same.
03 - Spider-Man - No way. Too much at stake for Sony.
04 - The Guardians - Third solo movie confirmed.
05 - Dr. Strange - Second solo movie confirmed.
06 - Falcon - Considering there's a series called Falcon & Winter Soldier that has been officially announced, I'm assuming he lives.
07 - Winter Soldier - Same.
08 - Wanda - Considering there's a series called WandaVision that has been officially announced, I'm assuming she lives (though I guess it could potentially take place between Civil War and Infinity War).
09 - Vision - Same.
10 - Hawkeye - Has a rumored series in the works with a plot that could only take place after Endgame.
11 - Shuri - See number one.
12 - Valkyrie - Too much talk of her being part of an all-female team-up.
13 - The Wasp - Same.
14 - Thor - Fan favorite, too much potential left, fourth solo movie likely in the works.
15 - Stark - Though his death would be the most poignant of all, surely he'll cameo from time to time going forward. And yeah, there's no way they weren't setting up a wedding finale.
16 - Maria Hill - Could go either way, but I see her sticking around, especially if Fury dies.
COULD/WILL DIE:
(In order of most likely to die to least likely die)
01 - Thanos - Dude is toast.
02 - Cap - For sure dies.
03 - Nebula - Dies a noble death.
04 - Rhody - Seems expendable at this point.
05 - Fury - I could actually see Jackson potentially hanging it up/passing the torch after this.
06 - Lang/Ant-Man - Personally, I don't need a third Ant-Man movie, and after Endgame I don't know that his character really needs any more development.
07 - Banner/Hulk - I don't think he dies, but same as with Ant-Man, I also don't know what there is left for him to do going forward.
08 - Black Widow - No idea if her upcoming solo movie is a prequel or sequel.
DEAD PRE-SNAP:
(In order of most likely to come back)
01 - Gamora - Likely comes back if only because of Guardians 3.
02 - Loki - Stays dead. His upcoming series is a prequel for a reason.