I'm really conflicted on that.
It's a balancing act between visibility and fragmentation. On the one hand, something like CE of SFC can get swamped by the mass of LC posts, on the other hand, you really need a critical mass for a board to thrive; if you don't get that critical mass, it becomes a ghost town haunted by zombie posts (OK, I'm mixing my metaphors, but you get the idea). Given the large overlap in user base and applications between CE and LC, my gut feeling is that we're better off with the present setup.
Let me do the following, however: I'll set up a poll at the top of the board and ask Separation Science to email their list. After a couple of weeks, we'll look at the results and see what (if any) consensus appears.