Yeah, they could rebuild. Hiroshima and Nagasaki and that's with decades old tech. Modern scrubbing techniques, future-style waldos, Russian immigrant labour in 2040, etc.
I've maintained before they probably had it rebuilt within 10 years. Less. You should see how fast the Thais rebuilt after that horribly destructive typhoon smashed their coast. Corps had serious money, tech and the desire to prove something.
Also, Morgan isn't dead. Pfffle.
Adam is, though. Because Adam sucks.