This might be news for you but The Original Trilogy wasn't 100% planned either. Return of The Jedi has a deleted scene of Luke Skywalker and Princess Leia kissing. The same movie
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Wild Hogs 2 Updates: Why Disney Canceled The Sequel
Sky High (2005) - IMDb
Sky High Director Is 'Ready' for a Sequel to Superhero Cult Classic
A Troubled Peace (Under A War-Torn Sky, 2): 9780060744274: Elliott, L. M.: Books
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The Real Reason We Never Got To See Sky High 2