Why do you need a goal? Do you live your life thinking about the ending? Looks like some of you should read Hunter x Hunter...
Rocks had a goal, and if he didn't, it wouldn't matter. The guy is a pirate; he lives to have fun! Sometimes they have to put aside their shonen and powerscaling mentality and just have fun. That's the goal of Oda, a Laugh Tale.
God Valley is not ruined, the world changing events will happen, only some of the participants are there to rescue a comrade and someone they love, they never expected that this would be a turning point in history.