heh, the forums are dying? the numbers of active members we have these days are way higher than they were in years past. sure, activity might have waned a little bit, but that is mostly because b/w has now been out for a while. i'd wager a high amount that this summer will have record levels of activity.
as for your "members leaving for other sites" that is an unfortunate reality pokebeach has faced for quite a while now. your average members here is a lot younger on pokebeach than on other forums. (our typical members tend to be middle school aged...on other forums, it's late high school/college age) in a way, some members "outgrow" our forums, and leave for bigger sites like pokegym (tcg) or smogon. (video game)
but of course, as one group of members leave for other forums, another is ready to replace them.