It will be interesting, but will the airport facilities have to change that much if at all? Evacuation proceedures may have to change, but could have say 5 - 8 doors & evac slides per side depending upon the the size and pax capacity of the BWB. I think pax won't really mind the windows loss that much when you consider that today the seating arrangement in the wide bodies. Could always use cameras and LCD video screens to real time screen the outside view on the bulkheads and deckheads.
I agree Airbus misread the changing market with the A380, but Boeing has too with failing to replace the B757 and B737.
Speaking of Boeing, it failed to receive any orders in January 2020 for any new aircraft and only delivered 13 jets, whilst Airbus receievd 274 orders for commercial aircraft and delivered 31 aircraft.
In an all-time low, Boeing wins zero orders and delivers just 13 jets in January
They would be great military transports, A2A refuellers, AEW&C, as well as heavy bombers, etc.