I really like the Bog Brook Trail and I understand that skiiers don't like post holes or snowshoe tracks where they ski. Whenever I snowshoe on a trail where there is a ski track, I stay clear of the ski track out of courtesy. But the skiiers don't own the trails any more than snowshoers. Bcskier is correct to say that JSTF cannot kick snowshoers off the trail. In the WMNF, out of courtesy, I stay off of designated ski trails or I keep clear of their track. Many ski trails junction with normal hiking trails for long stretches. Even there I will stay clear of any tracks when snowshoeing out of courtesy.
There are many trails in the WMNF that become unusable in winter due to snowmobiles. I hope xc skiers understand that I won't have my options even further deminished by ski tracks. Skiers are free to ski on any hiking trail in the WMNF(except downhill on Tuckerman's Ravine Trail), but to even suggest that non-skiers stay off of a trail like Bog Brook is not appropriate.
Happy Snowshoeing!
Forestnome