At least they're not doing what they did with the original BSG. That is recreating the horror that was Galactica 1980. (I haven't seen much of it, but I don't want to see anymore of it.) I'm also glad to see that it's ending on the writers' terms, rather than having SciFi pull the rug out from underneath their feet, like Farscape.
The spin-off is a little disturbing, but we'll see how it goes. It just seems that the core of what makes a Galactica series a Galacitca series is the fleet on the run from a vastly superior Cylon force. Whether you set the spinoff after the chase is over (as Galactica 1980) or before the chase begins (as seems to be the plan for Caprica), you really just yank out the soul of the show.
Anyway, I think the important point is this....
[Bender voice]
I've got 50-to-1 odds on all humans dying! Takin' all bets! Takin' all bets!
[/Bender voice]
I think Eick, Moore, and the crew have the positively massive cajones necessary to take the series out with an apocalyptic ending. They won't wuss out at the end and give us some lame Star Trek idealism at the very end.