Clarity and DOTS

In the discussion around Cassiopeia, it has become clear that Riot design is reluctant to put much power into AOE DOTs, and this is primarily for clarity reasons. It is very difficult in the chaos of a teamfight to register who is affected by DOT, and it is also completely unclear how damaging that DOT will be. This lack of clarity means that DOTs, especially AOE DOTs, have a lot of power but don't feel good for either side, but especially not the side being affected by the dots, because they just lose a lot of health in the teamfight without it being clear why or how.

There is a fix for this that Riot could implement, and I assume it wouldn't be too hard to code. When a DOT is applied, the total damage that the DOT will deal should be registered on the player's health bar via a colour change. So if Cass lands her q, or you run over a Teemo mushroom, the game should calculate the total damage that will be applied by all the ticks of the DOT, and change that portion of your health bar green. Or purple. Whatever. This would greatly improve gameplay clarity for a very common class of effects, and I think would be a very positive change overall.

At each tick of the dot, this colour change could be updated if further effects have changed the overall damage to maximise the accuracy of the indicator. So, for example, if you stand in Cassie's W, as the duration gets extended the colour change would be updated to reflect the total time you will be poisoned. Likewise if some later effect changes the damage the ticks will do.

Thoughts?