I thought the plans were to Built a satellite Terminal for Terminal 2 and an extension to the Pier in Terminal 3 and then Move all the carriers who use Terminal 1 to other terminals. Then demolish Piers B and C and rebuild them.
I don't see why the Main section (Check-In, Baggage Hall, Shopping Area) would be demolished if it was only refurbished about 3-5 years ago. I understand with the Piers though, they didn't get refurbished, well apart from the removal of the carpet in Pier B.