Technically and originally, Linux replaced the Hurd as the focus for the GNU team. I think some on the team are getting work going on it again, but it doesn't have the popularity of Linux. This is mostly because it's been decades in the making and still doesn't run on much. . . That's the danger of starting from scratch with a grand design. . . Linus' plan was much simpler, so it took off much more quickly.
The concept of the Hurd *may* be a cleaner, nicer concept of an OS, but it's taking so long to get it working that it's still mostly just pipe dreams.