It may, it may not, it all depends on how it's done. However, I don't see the staff allowing members to have their own username color even if there were a simple solution to it. I think our system is fine as it is, and I'm sure a few more, if not almost all of them, would agree with me.
Besides, having your own username color isn't everything. I'm content on the other forums where I don't have a choice of username color. If it's a big deal to you, then go to a place where there are options for that. @@;
Matt, the member color is link color, not black. XD