Rick,
This website will undoubtedly go a long way toward increasing participation. The disemmination of information related to benchrest is beneficial and so is the give and take on various forums.
One problem which is everpresent and even increasing is the expense related to competition. This applies to everything from equipment to components to the cost of travel.  Another problem is what one might call the "intimidation factor". People are convinced they will have to (a) spend major bucks on a rifle and optics and (b) always shoot little tiny groups. Neither situation is always true. It is possible to have fancy equipment and shoot big groups and it is possible to have slightly pedestrian equipment and shoot respectably well.
Another problem I have noticed at some of the matches I have attended is the seeming inability of some shooters to just shoot their match. Their actions and behaviour don't just lean towards poor sportsmanship but are perfect examples of it. In addition, the concept of gentlemanly behaviour has apparently been cast aside over the last couple of decades. I know this is largely reflective of society as a whole but a bit of effort at good manners would help to attract and keep shooters. In years long past, there were always some shooters whose language could be described as "colourful". In those days these people were mostly the exception and, perhaps, tolerated because of it. Nowadays, the use of vulgarity is overwhelming ( and I don't say I've never been guilty) and I know it is offensive to some who would attend the matches. It shows a lack of respect for others and it's reduction would help to attract new shooters. Really!
As I said, this website will do a lot and Rick, you are to be commended for your work in setting this up.   Regards,   Bill.