But of the over 20,000 people left, I doubt they'd just roll over and accept suffering for the rest of their existence.
I don't think the intention was to accept suffering for the rest of their lives, but the roll over part rings true; as mentioned the survivors, that is to say the last remnant of humanity, had gone through its worst period in their chapter of evolution/history. On the brink of extinction all, every one, was forced to do things they would never have considered, as exemplified by the main cast. The idea was to, I think, atone for what had passed before generationally and in doing give the future of humanity a chance to start over... a "clean slate" as said in the final moments of the episode.
What did bother me however was...
A.) Cavil committing suicide; this just does not fit with the character as I and others saw him. Resurrection had eluded him, and the rest, and so his death would have been his true end and I just don't see him giving up when previously he had demonstrated such a tenacious ambition to achieve his goals, to survive and to advance "his people".
B.) Starbuck, the mysterious who-or-what is she; okay so we know she is something special but what, exactly is never truly explained. This bothers me because she was such a pivotal character throughout and to leave her ends loose like that strikes me as unfair to the viewer. We, the fans, invest a lot in a show like that and I just think it would have painted a more complete picture had we been given a definite answer about who or what she is. Instead we have the looming questions... how did she come to be on Earth (the first Earth) as a corpse? How did she know the patterns? Where did she really come from? I can only hope that we will be given the answers to these and other questions in the future spin-off.
And on a lesser note - how tough was the Galactica, exactly? It seemed in the throws of death for episodes previous, then managed to endure protracted battle with the Cylon colony, then managed a jump when previous references had made that sound unlikely if not impossible, then it held atmosphere long enough to disembark the crew and make the flight from Earth (our Earth) to the sun...