how would the entire story of Homestuck change if dreambubbles were never created?

Without Bubbles, Calliope would not have gone to the Bubbles after dying, which means Lord English would not have started tearing down Paradox Space trying to find her. The Game Over Timeline could not have happened, John likely wouldn’t get his Retcon-y powers… Without Retcon Powers, John wouldn’t have been able to go confront Caliborn in whatever Timeline the Masterpiece happened, which means Lord English wouldn’t have even been created in the first place… It would’ve been quite the boring and simple SBURB Session.

And worst of all?

Aranea wouldn’t have been able to tell us about Cherub Snake Sex.