I'm fine with some being killed and others being only erased and more likely to come back because of planned sequels. I just want to see how they solve the dilemma of bringing the erasures back. The Time Stone would be one solution. Just rewind back to before the finger-snap - and make sure Thor aims for the head this time....lol. But, how do they get the Time Stone back and then get someone to operate it with no Dr. Strange? I assume Wong knows how, but I can't remember if he survived.
If they do get the Time stone back, why not rewind even further back to also bring back the killed people? Well, that would mean rewinding all those battles as well. Probably don't want to get into an "Edge of Tomorrow" situation where it may take several rewinds to avoid all those deaths.
Part of this /film article broke down who was killed and who was erased (onscreen).