bbPress.org

For anyone looking for news on this topic, I have a simple css solution:

/* FORUM */
.logged-in #main .bbp-replies.forums,
.logged-in #main .bbp-pagination-count{
display: block;
}
#main .bbp-replies.forums,
#main .bbp-pagination-count {
display: none;
}

This does not hide replies programatically, just hides them from view, but this might be good enough for some, as it is for us. It is just a barrier made to make people signup / login.