consider the following
What if after winning the tournament Goku becomes disgusted with him self. He thinks over how much horrible things came to because of him gaining god-ki. Zamatsu chimping out and black being created who destroyed future Trunks world, all universes getting destroyed in future Trunk's time line, and 11 universes getting destroyed in his time line.
He also regrets how he spent even less time with his family because he was so focused on reaching the next level.
He wishes he never met Beerus, the epilogue happens, Goku ditches his family to go train a shit skin that is a reincarnation of the most evil being in the universe because of a wish he made, and Tori declares GT is officially cannon.