You are all stuck in the 1940s.
For all you know, the wife could be the investment banker on £1m p.a. offered a more senior role in Dubai with a promotion, which benefits his "lifestyle" as well. He is more attracted to the stability.
Unlikely, but assuming she is simply looking out for herself is sexist.
Frankly, if she is looking for the better education of the kids, it is a case of 2v1 or even 3v1 in the argument for the move...