#1 Kinda tired of the Grab 'n Go options. There's already so many, and the Theatre Cafe is barely open sometimes, even during a busy week! I'd like some more proper food options in the park. Hell, would be cool if Hollywood Grill would be demolished and made into a two story "Hollywood and Dine" restaurant with more high end food and a second level open terrace. Not as fancy as something like Carthay Circle, but definitely higher quality than everything else currently offered.
As for Race Through NY replacing Shrek, it would definitely "fit" but I'd rather not see that, unless that's the best use of the space that's available. I'd rather see a small dark ride in that space.
However, I've said for a while that it I was in charge, I'd demolish the Castle Theatre and put in a ride in that location, and maybe even combined with AA.
As for Shrek, I'd make it become the park's flex space + attraction. It'd be designed to have an ornate NY Broadway Theatre facade, with an enclosed lobby + queue + merchandise where the current outdoor Shrek queue is. As for the inside, I'd have it be a relocated SES or even better yet something like Singapore's Lights Camera Action show, or a combo of both. The first half of the show would be similar to SES right now, and then the finale would be a full run through of a special effects scene.
If need be, the space could be used as a flex space for seasonal shows or events since the facade and interior will look like a theatre (Halloween Horror Nights show, movie screening, or use it to house a Grinchmas show). For non-show events, the seating could be removed, and it could essentially replace the Globe Theatre for private events, and in the process open up the Globe Theatre for a new attraction.