The OG Avengers are still alive. Which means they are the ones we really need to fear for. Will one or many have to sacrifice themselves to save the ‘new’ Avengers who Thanos wiped from existence?
As you said the new guys all have their own trilogies to finish. Cap, Ironman, and Thor do not. I’m sure one or more of them are going down. Probably Tony and maybe Cap.
As for the folks who died before Thanos snapped his fingers here’s my take on if they are coming back:
- Heimdall - dead 99% sure
- Loki - likely dead 75% - could be brought back by trickery if there is still a Thor or Asgardian story to tell in Phase 4
- Gamora - 1 in 4 she stays dead - she died in relation to the Soul Stone and Thanos sees her younger self likely in the Stone after snapping his fingers - easy to hand wave her back to life after he’s defeated in time for Gaurdians 3
- Vision- 50/50 - he’s a newer Avenger -Dr Strange wanted Thanos to have the time stone which means its use is likely part of the way the good guys win - we saw Thanos use it to bring Vision back to kill him - might we rewind back to the moment before Thanos gets the mind gem from him? Or they could leave him dead as part of the stakes paid