It is the first bit of hopeful speculation I have seen. To not have season 4 finish would have been like having GL decide to never film EPIII, but even worse since we at least had some idea of how it was going to end.
There is a decent bit of money at stake here. The actors do get residuals I am sure, and BSG does well for Internet and DVD. So, I remain hopeful. It would a total clusterfrak for them to leave the story unfinished.