I think the reason for the site not updating anymore is that WIN is getting more hardcore and Bopping Babes is basically a tease site. Over the last few months there has been a definite move towards harder material and it looks like the more softcore content is on the way out.
I know WIN is getting harder but they could eaily have made Bopping Babes harder too if they wanted. I think the real problem is that Bopping Babes never had a strong enough identity. It was always too similar to WIN and many of its videos could easily have been shot for WIN. The fact that they are now making some Bopping Babes style content for the WIN site kind of proves the point.