TVLINE | Did you have any kind of alternate ending in the bank, on the off chance you didn’t get renewed for Season 4? Any alternate footage to wrap things up differently had it been a series finale?
No, I kind of throw everything I have into every season. We know that if the series had ended [last summer] with the shooting of Rachel, it would have been a really shocking and awful way to end a run, but at the same time we felt like there would be some closure — they brought home the cure and the audience can sort of suppose what life would be like in the future. Similarly, if we ended the show now with Chandler going off, I guess it would be sort of a farewell, as I said, to one of the Founding Fathers of the new country and the audience would have to speculate, “Gee, I wonder where he would have gone?” But at least the problem of the season was solved.
Source and more: TVLine