As much as I do think SxS are doing a LOT of harm, I would have to say no. Much of what is now closed, wilderness areas anyway, have been in the works for years, decades really and well before SxS were ever around. The harm SxS do today are to routes and areas currently open to the public. Assuming the damage they do continues, they too will be on the chopping block. I guarantee it.
That said and as much as it kills me to say... I'd rather have ALL of it at risk of being destroyed than to be restricted from accessing any of it.