I think that the events involving the last poneglyph and the war that will upcome, plus the events of Fishman Island being compeltely destroyed as predicted will be the next breaking moment.
I think bonds in the crew wont be an issue and ahead this arc is shown to have adventure and action, but dram maybe be "pushed" for later.
Look at Robin in the last chapter ( punk hazard ) all smiles and little hearts. Is it someone who can leave just because she had not a number chapter ?
It could happen again immediately before they reach Raftel. A crisis of friendship the moment before they reach their goal would make sense, and it could be done without rehashing old plot.
If anything could see such a thing happen with one of the new recruits since the bonds won't be as strong who knows maybe usopp will get to use zoros speech from the W7 arc.
I can't think of a reason for Oda to create such a situation again, it just wouldn't make sense Imo. Wasn't their comradeship tested enough already? He gave them moments of doubt, long periods of growing together, tested their bonds with each arc. They've reached their final part of t heir journey, worked their hardest to be ready and for whatevery they aren't Oda's got to make them breach through because of their friendship[like with FT, but far less ass-pull]. A crisis before the end, that'S like confessing that their build up throughout the manga was a failure.
^Seconded. At this point it would take a major event or a long setup for another crew-breaking moment to happen, IMO.
next crew breaking moment is after the final fight...all their dreams are completed and they will disband. end of one piece
Actually I don't think many people realize that some of the crew members haven't been part of the crew for very long. I mean if you think about it, they have spent more time away from each other then they have together durring this whole ordeal. I mean the longest crew member had only been in the crew for only a year, and that was zoro. Afterwards they were away from each other for two. Brook had been part of the crew for at most probably a month and franky was probably only with the crew for three months at most. So if they came back after all that time apart, then I'm pretty sure that they aren't goin to seperate, even if they get into a disagreement.