I'm not unconvinced the bridgehead over the Rhine could have been had. The thing is I've never seen any serious evidence supplies for forty, or twenty, or even a dozen divisions and corps/army overhead could have been provided to exploit such a bridgehead. About the best I see happening is 21 Army Group fights its way a bit further north to reach the Zuider Zee thus isolating the western Netherlands from Germany, and having a slightly better starting position for the spring offensive.
The idea that the Allied armies could exploit a break though of the western German defenses in September, at Arnhem, Aachen, Trier, or Strausboug or anywhere else was based on a misunderstanding of the German armies recovery and the depth of the Allied supply problem.