I suspect that the decliners are not talking of decline purely in the economic sense.  Just to mention two other aspects of their platform.

Partly, they want to address the issue of violence and they want to redefine womanhood by restricting abortion (remember Trump saying that women on his staff must look like women).

Ironically, some sociologists believe that there has been a decrease in violence in the U.S. partly due to Roe v. Wade.