BS hardly runs as is. I know you people like to think that PvP is so popular and such a huge percent of the population base but the truth is: it's not.
If you have to worry about PvMers not coming to BS because they can buy VP causing BS to die, when it only takes 8 people to get it running, that means there isn't even 8 PvPers around to do a round of BS and you know it.
If people leave because BS dies it won't kill the game, even if we assume seven people at all ranges that still a very small amount of people.