Person gets mad and claims that Blizzard pulled a Bait and Switch on them. This brings buyer's remorse and the player might try to seek action against blizzard. Would they win? probably not, but let's assume this happens en mass..
Baits and switches are illegal. They shouldn't use that technique.
You're asking "If Blizzard is really shady, evil, and willing to act illegally, should the AH go down?"