I've been wondering about this as well. I understand the need for allowing color-blind people to see the AOE markers, but at the same time, turning them from red to the present "cheddar cheese" color makes it more difficult for me, a NON-colorblind person, whenever I'm fighting something in the following scenarios:

- desert areas
- areas with those yellow-orange "calamity" crystals
- when bards are using Flaming Arrow
- when black mages use Flare or other fire spells

I would just prefer some sort of option to change it, that's all. Have a toggle for "colorblind mode" in the options menu somewhere, like a lot of other games have, or set up some sort of RGB slider where you can select what color you want.