Here is a great read as to _why_ Galactica 1980 was so bad. It explains so much that I would sort of like to see the episodes again and look for the 'edutainment' features.
http://www.blast.net/hart/BG80.htm
As far as the baby goes, nope, they can't kill that plot. Sharon is doing what she must to stay alive to have the baby. After that, she will revert to regular old cylon tendancies and won't help the fleet afterwards.
Nuclear destruction of the pegasus? That sounds very plausible.
There is another thing which can be brought back. There is another flesh and blood number 6 running around the fleet. She was in season one and trying to seduce Adama. We might see her again.
Also, we still don't have anymore info on Starbuck's operation and scar...some plot can get picked up there
We still have the cylon reporter
Tom is still around, my guess is he setup Apollo to take over the black market.
Lots of possi-billy-ties