"Mountain biking is no more damaging than other forms of recreation, including hiking."

S Curtiss wrote:

People need to adjust to other people. Consideration for other people,
regardless of activity, is the priority.

Well-stated.

It's not a question of who was there first. Nor, as some mountain bikers
might desire, a question of which users there are more of.

Since everyone agrees that trail and wildlife impact is no worse for
bicyclists than hikers, you cannot argue for access of one group over
another based on impact. You could argue to not allow equestrians, since
they have a much bigger impact on trails and wildlife than hikers and
cyclists.