I don't know either, I was surprise for awhile they kept having re-runs, and found it odd, sort of set my mind out of sequence when I first saw they were going back and forth, Abby's prepregnancy and then to after the baby was a few months old and then back again. I understood the reruns but for a few minutes I muttered to myself. Ha!ha!
I wonder if it is coming back or ER has run it's lifespan, I just don't know.
I love House, even though he plays an arrogant character, and some of the stuff is unethical. Like I doubt if there are hospitals where the director barges in while a doc is taking care of a patient or surgery with a low cut blouse and her boobs nearly coming out. Ha!ha! Hubby doesn't have any complaints. LOL!! But he will even say, "C'mon that is something I do not think you will be seeing in the "real world". I think Hugh Laurie is quite a handsome guy.
Didn't mean to stray from ER, but brought to mind the other hospital type show(s).