ER tonight!

I will admit to being an ER fan from way back. There is another new show on tonight, though it looks like now Abby is leaving. She is one of my favorites and has been on for years. I know it is the last season, but do we have to kill or move everyone off before the end???? The first episode saw Dr. Pratt die, so what's next? What's up with that, anyway? Why do we need new people at this stage of the show? Why can't the old ones just fade out with the show. I also heard that some of the old people from years back are coming back too. Might be interesting...