I still read over BITOG sometimes, and there has been a noticable decline in the quality of posts. (There's even a 5-page thread going on about it over there.)
I think a lot of it has to do with the bad decision to cut off the board for a month in December and the poor choice of the new bulletin board software which doesn't allow easy searching.
I don't think BITOG will soon disappear, but the BITOG heyday is definitely over.