As an unabashed MF fan, I'm still going to side with you guys on this; it sucks he got disabled. It's actually super insulting, when you consider how much of the lore they changed BECAUSE they didn't want gameplay effecting it or vice-versa. Completely retconned the League because gameplay and story shouldn't be related in any way. "It's just silly."
So let's disabled a champion because of story/lore reasons, effecting how people play the game. That'll be neat and attention getting!
Seriously, shoulda just let people use the spooky skin for free for awhile. It'd be a homage to your "event" without actually impacting gameplay. Oh, and it would be about ten times more fun, rather than ten times LESS fun.