People reduce their commitment. They step out. Or they don't step in at all. They think they are better off on their own.
They may be right about that. But if you care about the network and want them to be there, you will see them flee.
People remain on the sidelines.
The communication is non-committal.
The stakes are decreasing. It is increasingly difficult to find dates and make appointments.
It takes more and more energy to hold people to their commitments.