As said above, a victim of it’s own success.
Trekster…… Trail creep? The trail is where it was when it first opened. The issue with hully gully is the drainage.
He’s talking about the whole trail in general and I think he means people cutting corners and/or riding off the trail, which causes organic material to be dragged onto the trail and the original trail eventually gets lost in a sea of tracks. It’s a big issue, especially on technical lines, trail builders (volunteer or commercial) try to make interesting twisty lines, but your average numpty just straightlines them dragging organic material onto the trail.
The issues with Hully Gully are many and varied IMO. In theory, bench cutting trail into a hillside should be straightforward re drainage.