The only way LHR ceases to be a hub is in Silver’s dreams, and everyone else’s nightmares, where all the airlines have deserted LHR for a sandbank in the Thames!
Not quite. All the underground rail tunnels would remain, and the site would be redeveloped. In order to make best use of these sub-surface links, a "transit oriented" development would be built on the site - T4 might go, but Crossrail would remain as would the tube. This new "Heathrow City" would have buses coming in and out from all over - so it would very much remain as a transport hub, just not of the winged variety
does that make it 2-0?