We seem to have drifted (no pun intended) from runway occupancy to wake separation.
Returning to ROT, many airports where this is an issue (i.e. slot-constrained ones) are starting to look at real-time 24/7 ROT monitoring and analysis.
Raising and maintaining crew awareness of the need to (safely) minimise the time spent occupying a scarce runway resource is becoming increasingly important, and most airports have a Flight Ops Committee where such issues are discussed with operators.
Gone (well mostly) are those periodic exercises that many airports used to undertake with observers and stopwatches, measuring and recording a sample of ROTs, or by asking the ANSP to try to derive data on velocity and acceleration/deceleration on the runway from successive radar recording plots.
With the advent of multilateration and ADS-B, it's now feasible for an airport to profile every runway movement and to provide its operators with timely feedback on their crews' performance. I know that LHR, for example, were looking at such a system a couple of years ago, although for various reasons it hasn't yet materialised, but I don't think it will be long before we see some of the world's leading airports doing continuous ROT monitoring.