I think I know what's going to happen in the series finale, and it's going to be a major downer.
Whoever is not going with Adama is going to be killed, along with the rest of the colonial survivors and the rebel basestar. Starbuck is somehow going to be the catalyst for this final destruction (maybe she inadvertently discloses the location of the colonial fleet to the cylons). Those who are going with Adama will survive, and will at somehow evolve from just humans to cylons, thus ending humanity and beginning the cycle that the final five underwent 2000 years ago.
Some of that is wild ass speculation, but I'm pretty sure the rest of the colonial fleet is doomed.