I think that article is mostly clickbait. So much speculation going on and the comparison to Afghanistan is such a stretch. There is no sign of war exhaustion in the west. People might lose interest in following the conflict because it slowed down but Russia is such a big enemy in the minds of people that sending more equipment can go on for decades before voices grow to stop it.
And the fear that any peace that Putin can celebrate as a victory would only be a temporary peace is still very imbedded into the mind of many Europeans.