Even if we assume this prediction is again gonna fail, bt i still think so many failed predictions in the past would help him get this one somewhat accurate. Like maybe not 5 years bt 7 years. Or Maybe he mentioned in 5 years already calculating in the hypothetical extra time he may end up taking/ streching the series. :unsure:
Jk. Don't worry we all know OP isn't ending for next 10 years easily.
Oda has unending ideas which he likes to add in his arcs and so many unsolved mysteries, we haven't seen much of many major players bt few panels so it's hard to imagine this 5 year thing really working.
We have kaidos flashback
Roger pirate flashback
Void century flashback
Im sama flashback
Dragon s flashback