As Blizzard’s “make the shoulders bigger, add more horns and spikes” theme reaches its apogee in Tier 10, it’s obvious why a Cataclysm is needed: either they’re rebooting the armour sets before the “upside down Weeble” look goes too far, or all the doorways in the old world are going to be massively enlarged as part of the rebuilding effort so that characters can fit through them again.
Rumour has it that new players will sail into the Maelstrom on the upturned shoulders of these raiding giants.
Space goats riding elephants and cows on kodos all look forwards to this cataclysmic enlarging of doorways.
Gnomish geologists believe that so much of Azeroth’s crust has been mined and made into shoulder pieces that seismic cataclysm is in fact an inevitable product of the armoursmithing industry.