Anyone who expects Messi to return to Barcelona, I'm sure he doesn't understand about football, it's likely that he is only a child who idolizes Messi as you said what was expected from Messi when Barcelona already had many talented young players this means they don't need old players anymore. Messi might come back but not as a player but in another position, for example as a coach in the future or even the club owner, who knows right? we don't know how long he is active as a player remembering his old age.