Re: Better if they had allowed main cast to die?
Killing off characters like anything has pros and cons. SG:A killed off at least two of it's leads Beckett and Weir, was it a good move that's open to debate. But in the case of Beckett the fallout was so bad they had to bring the character back (via a clone).
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.