Walt Disney tried a circus in Disneyland in December, 1955, six months after he opened his park. He went to great expense decorating the area and hired the best performers he could find, then got the Mousketeers to do commercials for it and called it the Mickey Mouse Club Circus. Every day there was a circus parade up Main Street USA to the circus grounds behind Fantasyland. It was a massive failure and Walt vowed never to try a circus inside Disneyland again. He was quoted repeatedly that circuses exist in the real world, and people don't come to Disneyland to see stuff they can see in the real world.
“We went out on a limb and put in a circus for Christmas season. Although it was a great circus ... It is something that can be seen without coming to Disneyland. We need things that are unique -- things that are ‘Disneylandish'" - Walt Disney, January 25th, 1956
I think TDO should have listened to Walt and gone with the Pixie Hollow or Wonderland concepts to pair with the 7DMT.