Actually, given enough topsoil in the right climate a "good" lawn is not much work. Paul's article on lawn care is quite good:
http://www.richsoil.com/lawn-care.jsp
We have lawn around our home which is green and lovely and full of clover and other volunteers. It's been mowed tall and is never watered or fertilized. It takes a lot of foot traffic. In dry Augusts parts of it turn brown.
A mature food forest may not be much work except for the harvest, which is significant. Fruit and nuts raining down can be a problem if nobody has time to gather them!
Putting in a new food forest is an investment of time and money. If you are planning to stay there long term, like decades, food forest is good. If not, your best bet might be in convincing him to shrink the lawn by putting fruit bushes that birds or people will both enjoy at the edges of the lawn. Certainly share the lawn care article. Less toxic gick and less work makes for a better lawn!