Age Of Calamity Created A Timeline Split

 The original Zelda timeline had a timeline split, and it ended up with 3 different new timelines as pictured below.

You may or may not know that these 3 timelines all end with the same game: Breath Of The Wild.

Last November however, Nintendo released Age Of Calamity. Allowing players to witness the great calamity. Age Of  Calamity's ending shows that everyone survived the great calamity and successfully sealed Calamity Ganon, very different from Breath Of The Wild's ending, where the champions are dead.

This creates a new timeline split, meaning the timeline could either go on to Breath Of The Wild or Age Of Calamity for whatever reason.