An idea for flash.

I made a previous discussion about the omnipotence of flash and that a rework of the spell is required before players start to seriously consider using more than a small core of spells (exhaust, barrier, ignite etc.).

Xelnath was the first person to post on that discussion, agreeing that there needs to be a mechanism change for flash. http://community.na.leagueoflegends.com/c/gameplay/rrNM40FB-summoner-spells-need-fixing-or-removal

What if flash were changed to a short range wall-juke on a low-ish cooldown, or with a condition for reduced cooldown (such as successfully clearing a wall)? Something akin to a Gragas body slam, or a Renekton Slice and Dice. Except instead of being a blink it would be a line dash with a missile speed.

This would create counterplay for champions who use a flash as a mobility spell to guarantee kills or escapes, as the champion would be susceptible to crowd control while dashing. This would be a good jungle spell, creating alternate paths for junglers who normally could not juke walls.

I understand this would be a HUGE nerf to flash, but I believe that it would also create a defined role for flash as well. As it stands now flash is just compulsory, and it relegates all other spells as a secondary utility.