i dont get it? this verse is about the finality of death. Noone is arguing that, how can they have a portion of what is done under the sun if they are dead and out of the race of the living.... if your trying to use this verse to say they cease to exist maybe you should read it in its context along w/ the rest of the scriptures(i am really not sure if this is what you are trying to say or not). This verse is about the futility of life once you die thats it all the things you worried and strived for no longer mean anything your race is done. its like after you hand in a test you cant go study at home, come back and correct your answers. Your prep time was before the test.
maybe these will help explain my point: dan 12:2 and many of those who sleep in the dust of the ground will awake, these to everlasting life, but the others to disgrace and everlasting contempt, isaiah 26:19 your dead will live their corpses will rise you who lie in the dust awake and shout for joy., rev 6:10-11 how long will thou refrain from judging and avenging our blood on those who dwell on the earth?.... they were given each a white robe and told they should rest a little while longer. 1cor 15:1 we shall not all sleep, but we shall all be changed,
i hope you dont think i am typing anything sarcastically or talking trash, this is actually a cool discussion. just dont want it to come across as that. its hard over the internet to convey tone.