Seriously, a Malthusian on the board
Solar, wind, hydrogen -- who knows what will take the place of oil.
As to the big megaports, they'd probably be re-purposed for other uses. Coal Harbour used to be rail yards and port land. Liverpool is redeveloping their old unused port lands.
Don't care about shareholder well being? Sorry, that's just a cop-out -- right now a large part of Vancouver's well being depends not only on trade, but people working for those horrible corporations. So until there's anew economic system in place, you should care. Shareholders keep (in theory, anyway) these companies accountable.