Rework flash

Seeing statistics confirming what i've been thinking about flash (only 4% does not use it), gave me an idea for gameplay improvement.

Flash being such a strong summoner spell that everybody HAVE to get it every single game is making the game feel a little repetetive and lacking of diversity.

My idea is to remove flash as a summoner spell and rather implement it to the game through an item. This will make the players see alot of different summoner spells more often (like have you ever seen clarity used?).

This item should be an expensive item that grants stats that it usefull to every champion (hp/move speed) so that everyone could get it. This will make players have to sacrifice an inventory slot for one of the strongest abilities in the game!

Having flash should be a choice, not a must.