And yet, they're not moving any CSXT trains over it as is, that should tell you plenty. LaGrange is a Class I mainline between two major cities, not a branchline on a short line operator held captive on both ends by the two roads that own it. The direction it connects in is irrelevant, because it's going the wrong way no matter which direction you head in, and the line frequently washes out. NYSW is literally not running regular traffic the length of the line.
As for the main south out of Syracuse, anything that works DeWitt Yard won't go that way, as that connection bypasses the yard, and that's probably a good number of trains.
The IMs down the main were detours, notice they don't run anything else that way. The trend over time has been traffic leaving the line, not increasing.
Avatar: NHV 669 at the south end of the "Pompy" in White River Jct., VT on 4/29/1993. Photo by Richard Roberg.
https://youtube.com/@NHVT_Productions