Please forgive me for my ignorance. Firstly, having looked at the charts there VFR corridors look rather narrow. We have a couple in the UK (the Manchester LLR springs to mind) and they certainly require good lookout. Furthermore, everyone tends to fly at the maximum permitted altitude (for obvious reasons). It seems to me that the NY corridors are extremely popular and not necessarily for any other significant reason than sight seeing. With helicopters, fixed wing mixing in the same piece of sky it is always going to be difficult to deconflict aircraft. Is it worth consider some form of flow control imposition on VFR aircraft (ie no more than x aircraft in the airspace at any one time)? The RAF did something similar a few years back when low level fast jets kept bumping into each other; limit the number of aircraft in a block of sky and you manage the risk.