If the Broads became a NP, it would be governed by the Sandford Principle which is stated on the government NP site as: “If there is a conflict between protecting the environment and people enjoying the environment, that can't be resolved by management, then protecting the environment is more important”.
There is no mention of keeping water courses navigable, so the BA could close to navigation those environments which it felt it could protect better without boats. This could be for instance Meadow Dyke, Horsey Mere, Waxham Cut, the Thurne from Martham to W Somerton and many other “extremities” which cost a lot to keep weed free, dredged and free of overhanging trees. They would, of course, keep open the main rivers so that all the big boats, which supply the majority of toll revenue could keep cruising and might even argue that more visitors would come to see the “newly protected” areas, where they could provide visitor centres and charge for viewing, bringing in even more revenue.
This is not something I want to see happen and is why I oppose the Broads trying to persuade the public that it is a NP.