Part of me wanted him to hit the switch in the safe room. Talk about a fantastic ending. Of course, it would kill the series, but damn that would have been sweet.
Wouldn't have killed the series. Could have made it better, actually.
Carrie vindicated. Saul vindicated.
Estes could have been in the bathroom and injured, not killed.
Walker still out there. Other parts of Abu's plan still in motion.
Country in political turmoil and shocked fury. Changes in American attitudes, suspicious of all middle easterners, calls for roundups and WWII style camps to keep tabs on them. Changes to immigration and travel policy.
Would have had Jess grieving and Mike coming back into the picture (yay, more tits!), the kids dealing with the dad they didn't know and how the public would trash them. They'd be pariahs.
Yeah, you lose Brody. But I think the series could actually have been stronger without him and the Carrie/Brody romantic angle.