Ted,
Your married to a Chinese National, so unless you break the laws of the land you will still have your residency visa, that has nothing to do with you working.
If you, for argument's sake had a Z visa and it was later revoked due to a new legislation, then you would simply exchange that Z visa for a normal residents visa. ....No big deal, your not going to be kicked out of the country!!
As I've mentioned before, there is also a massive demand for private English tuition in China, So if you want to work without a Z visa, then go about it, going the private tuition route!!
You should be finding out by now Ted, .... there are ways and means to get around most things in China....hahaha!!
David....