Funny you should raise that point as I am more and more beginning to assume that view. My kids are not that old and they are just beginning to work. I have actually been framing things in much that same way.
The kids are healthy and will move out at the appropriate time, but strengthening the clan financially ultimately helps them long after Mr. and Mrs. Obadiah are gone.
And also it puts them a better position to support us in our later years, should we run into financial difficulties. We must get back to extended families.
Makes a huge difference if you can sock away some money in your 20s, as opposed to starting in your 30s.