Freak electrical storm causes all flying mounts to be refunded.
Volcanic activity causes it to become unsafe to fly on mounts, causing crippling steam damage to characters who use them over water.
Actual flying mounts appear (not just swimming ones pretending to be flying) and trump the old ones.
Entitled kids playing a game begin to understand that entitlement does not get you everything on a silver platter 
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You realize the backlash staff would get if they tried any of those ideas? Besides the flying mounts.
Volcanic activity wouldn't work. Unless you made players unable to swim as well.
On the note of graaloween. I think it would be cute if all of the baddies dressed up as well. Lizardon's as trolls, spiders are actual spiders, ect.