This entire site is driven by CSS, so it's entirely possible that it could be changed. However, someone from higher up than I would have to request a change from whoever does the theme. However for your own personal benefit, you could install an Extension if you're in Chrome or Firefox to modify the CSS for this site. As an example, I installed User CSS, then added a quick style in order to make the change I wanted to. You can also do this without an extension (check your browser's online manual), but I find an extension is much easier to make changes on the fly. Here's an image of me altering the links so they are red:
Of course, a better solution would be to change the
a:visited style so that it's much lighter and/or underlined and/or somehow not looking like the plain text. The contrast is visible when your screen is very bright and there's not a lot of extra light, but I totally agree that it needs to be updated to be more functional than it is now.