It's completely logical to not have the media icon be featured in the park because they've done exactly that with four other icons. Jack and Luck the exceptions. The marketing of the event, even in the aughts when it was aligned, is still it's own separate thing. The actress can film the commercial, do the press photos and then quit her job tomorrow and Universal could still use Chance. She may own the performance, but she doesn't own the character.
Again, she's a person with her own stuff going on. She's not a monkey the fans (or even Universal) can demand to be in a show if she doesn't want to or isn't available to do. She's an extremely talented actor who can obviously get more work for herself than playing a killer clown. Just because the fans demand it, that doesn't mean she has to do anything for them.
If a show happens, great. If it's her, even better. But the vast majority of people don't care that the guy on stage playing Jack is the same as the guy in the commercial. As long as they see the "icon" (in a house, zone, or show) it doesn't matter.