She made a mistake once...
when she said, "Whatever makes you happy." That's when I bought my 1/4th interest in the Cessna. She swears she'll never say that again!
Ultimately, the best possible thing would be for her to develop an interest in flying and then say, "You know, we really need a faster plane." That's not very likely but it could happen. The AOPA has what they call a "Pinch Hitter" course to teach non-flying partners how to land a plane in an emergency. I'm trying to interest her in the program. Quite a few wives have gone on to take more flying lessons after taking the course.