Nothing stops people with access to newnews groups from subscribing to
MUSEUM-L (except lack of awareness and/or interest in it). So, people
with an interest, whether it is manifest through poking around netnews
or by accessing the MUSEUM-L listserver directly, _will_ "barge in".
You can't stop 'em.
 
I really do believe that the greatest difference between the two access
methods is the fact that they provide a choice of methods to those who are
interested in this topic, and that the noise level will be no greater than
it is now. Museums as a topic of discussion are just not that "hot" a topic
in most peoples' idle pasttimes. (Would that we be so lucky!!)
Peter