User blog comment:SirAston/Thoughts and suggestions regarding Summoner Spells/@comment-3297251-20130808154800/@comment-3297251-20130808231513

Limiting the number of uses is the only way to actually balance it. I cannot think of any other means to nerf Flash.

Ah, yes, maybe one other way. Someone had suggested it a long time ago : giving Flash a casting time (Think Fiddle's ult) so that you cannot use it as a emergency escape and would have to think twice about using it in a chase.