My personal take-away from choosing to save Triss on Iorveth's path is that Iorveth is very badly injured and his days as a front line commander are very likely over. However, I can't imagine that CDPR devs put that quest item in the game just as troll bait, or for misdirection. I also can't imagine that CDPR is going to completely abandon the great characters and unresolved story arcs that made TW2 one of the best RPGs ever. Geographical distance doesn't really seem to matter much in TW2, as you can traverse the entire countryside in a brief cinematic, so I wouldn't be surprised to see major characters and their unresolved arcs in TW3.