Where we live in Northern Ontario there are actually four different school boards* and many schools around the region slated for closure.  It's extremely inefficient.  Of course these boards all have huge overheads of administration staff, maintenance staff, busing, and half-used buildings and land.  Besides the inherent unfairness of it all, there's also the cost!

*That's right...
French Catholic, 
English Catholic, 
French Public, 
and English Public

Of course they all fight tooth and nail against even the idea of sharing facilities, let alone amalgamation.