Seussical won't come back to Broadway for a long, long time. The show makes waaaay too much money being licensed and performed by community theatres and schools for anybody to want to limit that income by putting it back up in a venue where it originally flopped.
Besides, the problem with Seussical on Broadway wasn't that the sets were too big, the problem with Seussical on Broadway was that it was an overblown mess of a show that ran 2 and a half hours had about 14 different plot threads running at once and yet was supposed to appeal to 5-year-olds, that it inexplicably focused more on Seussian D-listers like General Genghis Khan Schmitz and Gertrude McFuzz than actual icons like the Grinch and Sam-I-Am, and that it felt like one of those theme park revue shows, utterly devoid of any heart or inner life (a crucial component to any Dr. Seuss work).
About half of those problems were eventually remedied in the version of the show that can be now seen across America, but in my opinion Seussical will always be a muddled, unsalvageable mess for one simple reason - it will always attempt to be an amalgamation of every Dr. Seuss story. If the Seuss estate had just made musicals of ONLY Horton Hears a Who and ONLY The Cat in the Hat and ONLY How the Grinch Stole Christmas (well, they did that one and it worked out just fine) instead of trying to mash up every Seuss story like one of those "every-Simpsons-character" dorm room posters, they might have come up with a longer-term and more artistically faithful theatrical enterprise.
tl;dr: Seussical is utterly terrible and has become less terrible over the years.
Formerly SirNotAppearing - Joined 3/08