It does seem to fit thematically more with Main St. than Tomorrowland. Now, I dont see space-wise where they could fit it, barring the removal of that parking lot behind MS, which I am sure is required for stocking the shops and eateries on the East side of the street.
As Raven can attest, that parking lot gets a lot of use on a daily basis. Not only for stocking and resupply, but I also know the tour busses for Backstage Magic drop off and pick up there....