Nothing is set in stone
When it comes to parades or shows, nothing is set in stone. For ages the SOP for a show or parade has been 2 seasons and then retirement. But it depends on how popular the show turns out to be. Look at Main St. Electrical Parade. It was introduced in 1973 on a two year plan, and retired after the second season, only to be brought as soon as the next 2 season run was over... to play for what? a dozen more years? and now it's back for more encores at DCA! If it wasn't for America on Parade for the Bicentennial, it probably wouldn't even have retired that first time.
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