When I was a student I'd be all for this! As a working parent, it sounds like a nightmare to make sure the kids would have programs and supervision on the off days. One of their proposed plans is giving the kids every other Monday off, which I think is too confusing to schedule around. If you must do this to save money, I'd say end the school year earlier. I'm fine with extending the school days by 36 minutes so kids would still get the same amount of total class time.
If Burnsville does this and it works, I bet other communities would consider it. Should Duluth or any Northland school districts look into the following plan?