User blog comment:Lykrast/A suggestion about Flash/@comment-2094543-20130707164031

In case of suggestion 1, champions like Varus, Ryze or Mordekaiser would literally disappear, and strong disengagers like Kassadin, Ezreal, Fizz or Nami would dominate everything.

I agree that Flash is problematic - it's too ubiquitous, used too defensively and if you flash over a wall or towards your turret, isn't countered by any summoner spell -

Yordle Stompers might solve this issue, but the power of Flash as a free out-of-jail card or engage tool is so great that they'd probably just kill variety in terms of boots instead of summoner spells.

A better solution would probably be a summoner spell that reveals nearby champions and weakens subsequent Flashes by nearby turning the spell into a non-instant terrain-ignoring dash instead of a blink, or something...