Nations like ours with low birth rates and aging workforces depend on immigrants to maintain vibrant economies. The alternative is to become like Japan, where the economy stagnates and abandoned houses litter the countryside.
Thus uncontrolled migration can never be a solution to our population issues. Instead effort should be put into attracting more skilled workforce that is in demand, and they should come in legally.
There are competent engineers "waiting in line" for years, while illegals are allowed to stay... it's basically rewarding the criminals and punishing the honest ones.
Long story short, many people still want to have children, and not having fertility should be the problem that is getting addressed.
Male-female resentment is not the reason fertility rates around the globe have fallen precipitously over the past century. That's a bizarre idea.
When women have access to contraception and opportunities to participate in the workforce and pursue higher education, it turns out they are less interested in raising large families.
There are tools we could be using to encourage people to have more children, such as universal childcare and pre-K, generous financial support for low-income families, and high quality public schools. Unfortunately, opponents to immigration typically also oppose these policies, too.