The NICE Link didn't serve the two common destinations that people in Bellmore, Merrick, and East Meadow wanted to go: NCC for the college students, and Hicksville Railroad station. Those neighborhoods used to be served by the n45, n50, and n51, but those routes got eliminated due to low ridership and budget cuts under Mangano. People living there have been calling for their restorations.
Another factor seems to be that a lot of newer residents living on the South Shore want to be within reasonable walking distance of the bars, shopping centers, and railroad station for the travel into the city.