Seems like Emirates got sucked into a program costing millions and not being practical at all.
Bahrain ATC's are already cancelling RTA's on first contact unless you are the only one in the sky.
In practice a 777 doing m.79 followed by an A380 20 miles behind doing
m.87. because of RTA will irk ATC... now add another 10 aircraft all doing this type of shyte.
This system is bound for the trash can