He's taking a huge risk, IMO. Hopefully he has lots of insurance. Just one injury on his private property and he could loose his house, land, and whatever else he has.
What is the difference between kids coming home after school and playing ball?
That is what homeowners insurance is for anyways.
If it was true I could risk everything I had because of kids playing baseball I'd do it.
Are we going to live our lives in such fear of lawsuits that kids can't get together and play ball?