Respite for flightpath residents would be reduced (from 50% of the time to 33% of the time), but not eliminated.
Apologies, I was misreading the chart. In a 3-runway configuration, the two outer runways (the new NW one and the current 09R/27L) would be used as folllows:
50% of the time in mixed mode
25% of the time in segregated mode for arrivals
25% of the time in segregated mode for departures
So alternation respite would be reduced from 50% of the time to 25% (not 33%) of the time.