Hi -
Maybe one more reason for less screentime and more outdoor playtime is the connection with worsening myopia aka nearsightedness.
It might motivate your kids if they think they can avoid stronger glasses each year for the next 20.
Here' some info from our blog page,
http://treehouseeyes.com/the-myopia-blog/ with several articles about the relationship between too much screentime and too little outdoor time contributing to the myopia epidemic.
Hope the best for you, your husband and the kids!
And thanks very much for letting me post.
Thom
thom@treehouseeyes.com