> I mean, other countries would kill to preserve such long-lasting heritage, especially one that's in active use and very much a part of the city.
Nah. In China there wouldn't even be an announcement, you'd just turn up one day and it would be gone.
Tokyo famously redeveloped their fish market, and that was far more of a piece of popular heritage than either of the markets mentioned here.
This is no different from what happened to Covent Garden 40 years ago, and no-one sane wishes we'd kept that as a fruit and veg market.