I expect prostitution may be legalized nationwide, and not just in rural Nevada, eventually.
Reason being, the sexual revolution has completely transformed societal and legal standards. Sex outside marriage no longer has any social stigma. Nor does adultery. We have a culture in which its considered OK to have sex with any number of partners, any gender of partners. We have recently imposed homosexual marriage as a civil right.
Prostitution is simply another variation of sex activity involving consenting adults. As such, laws against it will be challenged in court or repealed.
“Prostitution is simply another variation of sex activity involving consenting adults.”
Except it very often doesn’t involve consenting adults. Women and children are often trafficked into the sex trade, or their protector will use violence, drugs, and isolation to keep them from leaving.
You also have sites like SugarDaddy, which is a form of prostitution as well.