Surely in the London area only a bit of tinkering is possible since with airports at every point of the compass and a huge proportion of flights headed east or south there is very little that can practically be done.
Sounds like an airborne version of 'smart ' motorways to me , and on a day where Northern Rail is nationalised by an arch tory government underlines that we really dont do transport very well in the UK. Although saying that thnka sto the ingenuity of those in the flying and ATC business we manage to keep things going with substandard facilities better than most but in the end that lack of long term planning and lack of actual space on the ground or in the air catches up with us