Boy, you did take awhile to look at the thread. The vandalism was reported last fall. Currently the road is blocked off due to mud season. You are correct that access to several trails and trailheads are at the mercy of the landowner who owns the property. Note that the Success Pond road association has a right of way over the road so it probably will remain open to some extent (although maintenance will most likely become more of an issue).
Local speculation is that once Dillon has cut it over, that he will attempt to "greenmail" some group into buying it in one block rather than cutting it up into recreational lots. The property on the southern face of the Mahoosucs has been on the AMC "secret protection" list from a few years back, so maybe the carnage on the north side will draw some interest.
Based on recent sales in the area, out of the area buyers could care less how they get hold of a piece of land and what condition its in. Unless the market cools down its going to be tough for non profits to pick up land