What if Ice Age ended after the third film?

Almost everyone agrees that Fox keeps making more Ice Age movies, but what if the series was a trilogy without more movies being announced, leading Blue Sky Studios to make more movies based on original ideas?

This theory is interconnected to What if Comcast acquired The Walt Disney Company back in 2004?, meaning that Disney didn't acquire Fox in this reality.

Changes

 * Dawn of the Dinosaurs would serve as the series finale. However:
 * A Mammoth Christmas still exists, but not The Great Egg-Scapade.
 * Video games based on the franchise would still be developed, although with several changes to only include contents from the first three films.
 * Continental Drift, Rio 2, Collision Course and The Ice Age Adventures of Buck Wild alongside Scrat's Continental Crack-Up, Cosmic Scrat-tastrophe and Scrat: Spaced Out would never exist due to being made as cash grabs, being replaced with other projects.
 * Blue Sky Studios would have never closed down.
 * The studio would release at least a film by year and occasionally two.
 * Most of the cancelled projects would be produced.
 * Spies in Disguise would perform much better at the box office.
 * The new 2013-2021 logo would not likely exist, meaning that the 2005-2012 logo is kept.

Films

 * 1) Ice Age (2002)
 * 2) Robots (2005)
 * 3) Ice Age: The Meltdown (2006)
 * 4) Horton Hears a Who! (2008)
 * 5) Ice Age: Dawn of the Dinosaurs (2009)
 * 6) /Spore/ (2010)
 * 7) Rio (2011)
 * 8) /The Iguana Brothers/ (2012)
 * 9) Epic (2013)
 * 10) /Foster/ (2014)
 * 11) /The Wainscott Weasel/ (2015)
 * 12) The Peanuts Movie (2015)
 * 13) /Mutts/ (2016)
 * 14) /Left Tern/ (2017)
 * 15) Ferdinand (2017)
 * 16) /Anubis/ (2018)
 * 17) /Escape from Hat/ (2019)
 * 18) Spies in Disguise (2019)
 * 19) /The Forresters/ (2020)
 * 20) /Santa Calls/ (2020)
 * 21) /Mystery: Check!/ (2021)
 * 22) /Nimona/ (2022)
 * 23) /Olive the Other Reindeer/ (2022)
 * 24) /The Magic Finger/ (2023)
 * 25) /Watership Down/ (2024)
 * 26) [original film] (2024)

In development

 * King of the Jungle
 * The Cyclone Thunderstorm!
 * The Blackouts
 * Frogkisser!