There have been calls to move the fish market out of Tsukiji[1] for close to a decade at least. Advocates for the move have concerns about the aging facility and desire to re-purpose high-value real-estate.
The olympics are just the impetus that finally pushed it through. I agree about the market being an iconic facility and I have good memories there myself. Hopefully the new one will be similarly accessible to tourists and an upgrade for wholesalers.
[1] https://web.archive.org/web/20121018042745/https://www.japan...
Tsukiji is basically in Ginza (or very close), which is some of the most expensive reasl estate in the world.
A parking high-rise, maybe?
The fish market, OTOH, doesn't have to be in any particular place. It needs good access to the ocean (boats) and good access to the roads (trucks). Moving it by a few miles isn't going to change their economics by much (if any).
(I am sad to see it move, though...)