Hi Mathieu,
So I see you started forum shopping (trying to get the Wikimedia-l people in) and making contentious trying to be funny remarks. That's usually a good indication a thread is going nowhere.
No, Wikidata is not going to change the CC0. You seem to be the only person wanting that and trying to discredit Wikidata will not help you in your crusade. I suggest the people who are still interested in this to go to https://phabricator.wikimedia.org/T193728 and make useful comments over there.