The color of the armor/glows are not what is important to that Heroic, Thunderforged, or Elite gear. It is that little tag in green and the fact the gear is more powerful. Only fauxcores and their epeens care about the color and showing off.
I would love to see an armor dye system, but it needs to be better than the one in other games. There needs to be full color control, not just just a couple large sections. We also need to let that extend to weapons and glows on both armor and weapons.