If you cannot afford to allow your wife to live the same lifestyle you have, then you are probably too poor or selfish to have one. If she desires a lifestyle higher than your own, then you are probably trying to buy some champagne with a beer budget, and that is a risk you are free to take.
Reducing alimony has made marriage more assortative. Wealthier and higher-educated/qualified women can better afford the horrendous economic risk they face in marriage, so they are more likely to marry and much more likely to become homemakers. That has delayed marriage and childbearing, as women have to become wealthy in their own right before they can take on the risk of marriage and motherhood, since men are no longer willing to accept that risk.
Marriages in which only women carry any risk at all, which is what we are rapidly trending toward, are unattractive to women. Which is why they now often prefer to just... not.
You cannot fool Nature forever. It will always balance itself out.
https://link.springer.com/article/10.1007/s11150-025-09821-1