While you make a good point about resources being finite, and people that can access those resources when said resource is scarce fair better than those who do not (especially water), you're point is actually a non point.
With such speculation, I could have a premonition of an alternative future where the initial settlers near all freshwater die, as the more aggressive and desperate peoples fight for the area, and this potentiality has as much merit as yours.
Also, why even say Detroit will come back if the original inhabitants are all but gone, and the area has been resettled by others? If Detroit's coming back in 2045, then [insert any maritime city/town/village/location/space] is too!
With such speculation, I could have a premonition of an alternative future where the initial settlers near all freshwater die, as the more aggressive and desperate peoples fight for the area, and this potentiality has as much merit as yours.
Also, why even say Detroit will come back if the original inhabitants are all but gone, and the area has been resettled by others? If Detroit's coming back in 2045, then [insert any maritime city/town/village/location/space] is too!