Exhaust is Broken (and how to fix it)

We've all seen it cropping up slowly, but I think we've finally seen the issue come to a head: Exhaust is being over used. In more than 75% of my last 100 matches, exhaust has been used by 2 or more enemy summoners. In about 30%, it was used by 3, and in 2 games, it was used by 4. Exhaust has become such an overbearing and overpowering summoner spell, that you get punished hard for not running it.

It has gone from a "I'm the support and the damage reduction could be very useful for saving one of my carries in the late game" to "I'm unsure of this match up, I'm just gonna take exhaust and be impossible to kill since it'll be up every time they try to fight me."

Now I propose a few things that might make exhaust more balanced. These could be used by themselves, or as a few together:

1. Give it the revive treatment.
2. Increase the cooldown to 300 seconds.
3. Allow qss to remove the current exhaust and negate the damage reduction from and consecutive exhausts after.
4. Decrease the debuff on damage from 40% to 25%
5. Remove the armor and mr debuff.
6. Reduce duration from 2.5 seconds to 1.5 seconds.
7. Change attack speed and movespeed debuff from flat to decreasing over the duration.

Let me know what you think.

-Ohana