Here is what the superintendent told the school committee, according to the Globe:
"Superintendent Carol R. Johnson stressed last night that turning the six elementary schools into a feeder system for the Irving would benefit more than just Roslindale, pointing out that slightly more than half the students who attend those elementary schools reside outside Roslindale.The committee is expected to look at the issue again next week.
Many students, she said, come from Roxbury, a neighborhood with too many underperforming schools. Johnson also said the arrangement could help the city compete more aggressively with the state’s independently run charter schools, including the Renaissance, which is moving next fall from downtown Boston to a location near Roslindale."
I know that for parents looking at elementary schools in the Roslindale area, the fact that they all end at fifth grade is a big concern.