If the pulsefire Caitlyn leak is true..
Then I bet Riot will nerf Caitlyn after people buying her pulsefire skin. Like imagine Ashe. Ashe after Project Ashe skin but I'm not saying Ashe is weak or anything now, though. I just think she'll get nerfed.
UPDATE. What I mean is if a champion get nice skins, people will buy it and start playing with it. Once Riot sees why Caitlyn is too strong they'll nerf her.