And back to the original question. If aircraft are not regularly vectored out of the holds the TMA have no where to put the incoming planes. We still,regular see the TMA vectoring inbounds all at FL 150 around the Soutn East preying a level will become vacant soon.
As for new techniques, yes they will work, but not without a large scale airspace redesign.LAMP 2 anyone?
System has been creaking badly this year, combine that with low staffing levels and it's going to get ugly!!,