“ A large part of this was that only those with reservations were allowed near the Louvre. As a security measure, absolutely no one without a ticket in hand was allowed to approach the museum. Had the Louvre been as accessible as it normally is, those standing in the no ticket line would very likely have made up the 22%.”
This security measure was only in place in the few days leading up to the opening ceremony on July 26. As soon as the Opening Ceremony was done, so during the Olympics, everyone with or without a ticket for the museum was allowed to go near the Louvre. I know this because I actually went to the Louvre several times during the Olympics. I went there both during the day and in the evening because that’s where the balloon with the Olympic flame was stationed. In addition to that there were Olympic Rings right in front of the Louvre Pyramid that were a very popular photo spot.
The few days before the Olympics that the Louvre was only accessible for those with a ticket could not have caused the 22% drop in visitor numbers during the Olympics.
And like I said, I had that exact same experience at the Musée d’Orsay. And I even went there on August 4, the first Sunday of the month when entry is free. I’m not going to say it was empty, but it was much less busy than when I went there the year before on a regular Friday in May.