I imagine that in 30 years, it will become clear that individual humans display enormous diversity, their diversity increasing as societal norms relax, and their behavior changing as the culture around them change. As such, replication is hopeless and trying to turn "psychology" into a science was a futile endeavor.
That is not to say that psychology cannot be helpful, just that we cannot infer rational conclusions or predictions from it the same way we can from hard sciences.
Self help books are enormously helpful, but they're definitely not science either.
