IIRC, the way Walter set up the ownership on the former DL&W lines makes it extremely difficult to evict the NYS&W, and they have no plans to leave; while there also is no strategic advantage to them to expand northward either. I'm not up on if the railroad owns that line, or it's owned by the county and operated by the MA&N as so many shortlines do to beat property taxes.
I would have suspected if anything was likely it would be the MA&N to add some of the former DL&W, also, until the possibility of using the line for fracking sand and water trains came about; with that, and the application of grants to repair it, any rumor about a sale is going to be just that, a rumor.