When a river cruise turns into a bus ride, what rights do passengers have?

Skift Take
Just as river cruises are becoming the hot thing in European travel, mother nature is stepping in -- in the form of seasonal floods and Global Warming-driven level rising -- to slow things down. Expect this to be a growing problem over the next few years.
Al Chapper’s trouble with Vantage Worldwide River Voyages isn’t just the most common river-cruise question I get. It’s the most common cruise complaint, period.
Which is why I’m thinking of