I know what you meant, just meant to say that lol isn't a static environment. As the game changes so does the champion even though no changes were made to them. Defensive Masteries are the reason for Olaf's new rise when his buffs weren't enough, while other factors made Kassadin even better than he was (and he never was out of favor in neither queues nor tournament environs). So yeah.
Seriously, if you don't accept that Kassadin should be nerfed, then no other champion ever should. I can't remember the last time we've had ban rates like this for a champion across skill levels and queues.
I like the fact that LoL isn't a static environment, it keeps it fresh even if it can be frustrating as hell to see old favorites become "sub-par" (don't play the tree, scuba man or pony much these days), either through straight up nerfs, meta shifts or other game changes. I don't think the mastery changes helped nu-Olaf as much as it did other champs, it probably would have been huge for the old Olaf though.
Yeah, Kassadin is an issue. I just hope they don't gut the champ or turn him into something barely recognizable (Karma) while fixing him.