First off, bravo to you and your wife for making a smart move. You have to be selfish about this or you die. It is just that simple. If others, especially those close to you, do not understand, and make no effort to try, then does it change what you need to do?
We had Thanksgiving at my house this year, like it has been done since my mother passed away 10 years ago. And I am thankful that the kids 'get it' about my limitations. They are picking up the slack and trading off from here out for holidays.
This is not a reflection on you or your wife. This is simply today's society pushing things that are inconvenient for them out of the way. Kids today live in an instant and disposable world. A potato in 5 minutes. Throw away your car in 5 years and get a new one. Shave, plates, cups, diapers, all just toss and forget. And it was only a matter of time before people became disposable too.
Be you and take care of you. You can't change the world, so be thankful for what you have in your small corner of it. God bless your wife for her support. My wife is also better than I deserve.