It's only a matter of time. In the UK, the national organisation that
looks after much of the building heritage has banned indoor photography for
the last decade or so. Partly for "security" and partly to make you buy the
guidebooks and postcards. The same will happen in National Parks, although
it will be more difficult to enforce. It's their land so they make the
rules.
No. Actually the National Park land belongs to the people. The government
administers it. They can set up rules that the park rangers will find it
"impossible" to enforce, and the rangers simply won't enforce them.
Usually, there are license fees for using the land for commercial ventures
(e.g., a commercial film) and no fees for private use.
If we accept that it is OK to charge to take photographs in "public places,"
by extension, we will have to pay for the right to take pictures anywhere.
Examples include: from a roadway, on a street, at a harbor, etc. Somehow, I
don't think this will happen.
Larry in Dallas