One of the worst aspects of the arc. All that fighting, all that struggle. For nothing, nothing mattered in the end, because they had to erase it. Worse of all, they had the absolute balls to then go to a new timeline. Everything's fixed!
Insanely depressing ending. At least let Future Trunks stay in the present timeline. So he can grow from their failures. A constant reminder how they couldn't protect their world, how they couldn't protect everyone. With Beerus not letting them get the Super Dragon Balls to save the people Zen'o erased either. A perfect furthering of hostilities against the GoDs, furthering also the themes set up by Zamasu. The gods aren't perfect either, and in many cases, they become adversaries against life itself. This sets up nicely the tournament too, as now the they are forced to work alongside Beerus whether they like it or not.
So many possibilities. But naaaaaah