I don't think Urth's Fount needs a nerf. Yes, it's hard as hell- and I love that. But why?

Because you don't need to run or complete Urth's Fount at any point. It's not part of the main story, it's only available at 50, it's gear drops are only for glamour purposes, and the only reward for clearing it is an achievement. Urth's Fount is 100% optional to progression in every way. So let it be difficult- doesn't that make the gear it drops all the much sweeter when you finally get a piece?