Visitors with upcoming plans for the MIddle Rhine Valley should not be deterred just because of this circumstance. The regularly-scheduled KD Rhine cruises between Rüdesheim and Boppard ended for the season on October 21 anyway. Only the tentative winter schedule (one boat per day, sails only if there are enough cruisers on hand) is normally in place at this time of year. Visitors can still get around by train to visit the riverfront towns and see the sights that are still open (like Marksburg Castle in Braubach, open year-round.)
It is actually all the more interesting now. How many times can you write home that you actually walked on the Rhine‘s riverbed?