Ignite deals too much damage for its low cooldown

Ignite is slowly crowding out all other summoner spells again - exhaust is practically non-existent because damage is so high anyways that a 40% reduction wont make a change.

Ignite's damage and cooldown are so disproportionally overtuned it's the optimal choice in every role but marksman. Marksmen need heal to get their supports out of trouble or barrier to have a chance at surviving the enemy ignites.

Can it not be the optimal summoner spell for half the roles in the game? Sure it makes for more damage and faster games, but it also makes for much less actual gameplay - even if you miss all your spells you can still slap an ignite on your target and basic attack them to death.