Just because it's pouring rain here in *Edit*New Brunswick (Why did I say California?
)*end edit* doesn't mean the West coast can't have a drought. Demographics and needs shift and change all the time. So just because schools in Moncton are overcrowded doesn't change the fact that schools in rural Saint John may be below the economically feasible/sustainable levels.
As for building schools; as I said before, that's a Long term solution. Unlike in SimCity, schools don't appear immediately. It takes ~5 years or so to get a new school figured out and built (give or take a year).
So if you have 3 schools, 1 at 120% capacity and 2 at 60% capacity, with a 10% annual growth rate expected, you could rejig zones so all 3 schools are at 80%. But next year that growth rate means all 3 schools are at 88%. 2 years from now, they are at 97%. 3 years from now, all three schools are over 100% full. And we're still 2 years away from that school the analysts said we needed 3 years ago.
I think that's what a lot of people are missing. They only see their own kids in the crowded schools now, so they want a solution NOW. Rezoning the schools will help in that respect; but ignores the bigger problem. With the anticipated growth in that area, E&Y looked at the numbers, and realized that without a new school, ALL of the schools are probably going to be packed to the gills. They looked past the immediate overcrowding and realized the real problem.
Assumably, if the growth rates for Moncton weren't looking so rosy; if the predictions said that the zone populations would stabilize soon, then they would have advocated redistricting and/or temp classrooms as a full solution.
What the School District needs to do now is to do the short term solutions (that they DON"T need E&Y's advice for), like rezoning and temp classrooms, while starting work on the new School plan, before they run out of short term solutions.