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 kinds of movies based on original ideas?

This theory is interconnected to What if Disney kept the rights to Oswald the Lucky Rabbit?, meaning that Disney didn't acquire Fox in this reality.

Changes

 * Dawn of the Dinosaurs would serve as the series finale.
 * The TV specials wouldn't likely exist, especially when the film trilogy already takes places before the birth of Jesus.
 * However, video games based on the franchise would still be developed, although with several changes to only include contents from the first three films as the primary source of material to use. That being said, there would be more forms of stuff that can act as the prequels for the first trilogy.
 * Continental Drift, Collision Course and The Ice Age Adventures of Buck Wild alongside the upcoming seventh Ice Age and third Rio films would never exist due to being made as cash grabs, being replaced with other projects.
 * Also, the shorts that serve as teasers/sneak peeks for newer Ice Age films and Scrat Tales wouldn't exist as well.
 * Rio 2 wouldn't likely exist due to mainly seen as a useless sequel created for the sake of profit, especially when the first film already had a perfect finale.
 * Blue Sky Studios would have never closed down.
 * The studio would release at least a film by year and occasionally two.
 * Starting with Ice Age: Dawn of the Dinosaurs, Blue Sky would introduced its new logo like this.
 * Most of the cancelled projects would be produced.
 * Spies in Disguise would perform much better at the box office.
 * Nimona would be released in 2022 by 20th Century Fox and Blue Sky Studios as a theatrical film instead of 2023 by DNEG Animation as a Netflix-exclusive film.

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) /The Wainscott Weasel/ (2014)
 * 11) The Peanuts Movie (2015)
 * 12) Babes in the Woods (2016)
 * 13) /Left Tern/ (2017)
 * 14) Ferdinand (2017)
 * 15) /Anubis/ (2018)
 * 16) /Foster/ (2019)
 * 17) Spies in Disguise (2019)
 * 18) /The Forresters/ (2020)
 * 19) /Mystery: Check!/ (2021)
 * 20) /Nimona/ (2022)
 * 21) /Santa Calls/ (2022)
 * 22) /The Magic Finger/ (2023)
 * 23) /Watership Down/ (2024)
 * 24) [original film] (2024)

In development

 * King of the Jungle
 * The Cyclone Thunderstorm!
 * The Blackouts
 * Mutts
 * Frogkisser!
 * The Last Unicorn
 * Olive the Other Reindeer