Yes, a common view at the time was that the only de-escalation possible would have been through workers cooperation, which is why so much of the Marxist flank of the SFIO argued in favour of pacifism: to buy time for the workers to unite.
Which probably wouldn't have worked, but maybe it could have been a much, much smaller conflict.
Understanding the lesson of the Guns of August was a big part of the anti-MAD/nuclear disarmament movement during the cold war: if you build a doomsday weapon eventually you will use it. A country does not spend as much effort and money as the European powers spent preparing for war without eventually going to war.
Which probably wouldn't have worked, but maybe it could have been a much, much smaller conflict.