Best of luck!
However,I would consider how much YOU would enjoy or use this feature and not worry so much about the resale (unless it's an obvious deterrent to the property). Rather, consider if it is a benefit to your family and does the situation also offer added benefits such as; playground nearby and piece of mind knowing your children can walk to school and not be on the road or waiting on the road, especially in winter or bad weather?
Inconveniences may include: regular traffic increase, children noise, parking issues, busy sidewalks, occasional litter created by children, etc.
On the positive side the benefits may include: buyers with children wanting to live near a school, walking distance to school activities, increased police visibility, "Drug Free School Zone," possible use of school facilities, contact with the community etc.
From our perspective the pros out weigh the cons but this is an issue largely associated to "personal preference."
You should be fine, since it is an elementary school, you should be fine, after it is younger kids who will be playing in the play ground.
Will it affect the price in the future somewhat, but not much. You will be getting a discount now
for the same issue.
If it was a middle or High, it would be recommended to pass.
It just maybe worth the convenience to you.