In my experinece if husband leave no problem there but if wife decides to leave that gives husband god-given opportunity to look for a reason to get out of that marriage and find someone else. So any woman who decides to stop being a witness better be ready to be on her own before you can say a kingdom hall.
I think women can use the excuse that a now unbelieving mate is a threat to her spirituality and get away with it. I don't think it would work as easily for a man claiming that. As long as the wife wasn't a threat, he would have no grounds to get out of his marriage. When I stopped going, a CO even told my husband that it was my right to put up a XMAS tree in my house if I wanted, attend another church and pretty much lead my life. He told him my religious decision was a separate issue from his wedding vows and did not relieve him of any responsibility in that area. It's ME that sometimes thinks he would be better off with a nice little witness wife to give him the support he misses.