Just listened to G and Luke Rowe discussing tubeless on the 'Watts occurring' podcast. Seem to be of the opinion that all teams at Paris Roubaix were tubeless this year compared to about 50% last time around and the majority of the crashes (particularly the pile up in the Trouée d'Arenberg) were caused because of a total tyre failure rather than a more gradual puncture. What you possibly gain in speed (though I'm sceptical over mixed terrain) you lose in reliability and on ruthless cobbles, I think it's just a step too far as yet.