Elmo is such a large part of the brand (now) that I hardly get a chance to add other characters to anything I design for Sesame Place. When I do try to put other characters into a layout as the main image, there is often client feedback to take them out and put in Elmo.
Granted at least at Sesame Place, the last 2 years have been promoting the new Elmo's World section of the park. I still try to get get some variety into the work but sometimes seems like the feed back is always more Elmo.
It used to be Elmo and Zoe a few years ago, and now its elmo and Abby. I guess we can wait to see what happens. I personally would like to see more Grover, and Super Grover.