I thought that's what "single-family zoning" means: a requirement to have nothing else besides single family houses. Eliminating this category of zoning means you can no longer mandate "only single family houses".

I'm unsure if zoning laws behave radically differently, but I'm thinking the best model is what they have in Japan:

http://urbankchoze.blogspot.com/2014/04/japanese-zoning.html

Things that can only be built in "low rise residential" zones can still be built in "neighborhood commercial", etc. See chart:

http://1.bp.blogspot.com/-sV5ETXDs_8M/Ux-axBTuF2I/AAAAAAAAAs...