Mental arithmetic; rough figures
At a glance and without my calculator or spreadsheet, these figures (thanks for providing them) say that the big two were at 96m in 2000 and in 2010 they remain at 96m.
In addition I believe that Stanstead is at roughly 50% capacity.
So even if the UK government accepts the economic logic of a New Deal style government funded work scheme to kick start the UK economy (which will be "needing" even fewer business flights and be "affording" even fewer leisure flights) it isnīt going to be a train line through the South Downs or an extra runway anywhere south of Manchester (which is I believe currently on about 33% of capacity.)