One of my husband's uncles found himself in this situation and as well as housewifing, he also had his wife to nurse. He learned it all fine and was proud of his cake baking achievements and managing to feed the two of them. It may have even given him a sense of purpose and the feeling of being needed. It certainly seemed to cheer him up.
Men aren't stupid, they just have a different mindset, so, as a wife, especially if they are particularly houseproud, your friends will have to lower their standards. The men will also have other priorities. If they can't see that the bathroom needs cleaning, that shouldn't be a worry as long as you don't run out of loo roll or other essentials like milk.
After all, one of them has learned to make tea. That's a start.
Maybe they could start a club and exchange household tips? Maybe the wives can start making notes - perhaps a little handbook for their husbands, while they still can.
And, of course, there's always the internet - starting with Gransnet and lots of ideas.